What do you think?
Rate this book
The Baker Street Mysteries #3
The Locked Room
The BRAND NEW instalment in Holly Hepburn's Baker Street Mystery series - for fans of Sherlock Holmes! Join Harriet White in 1930's London for another glorious Sherlock Holmes-inspired mystery, for fans of Nita Prose and Janice Hallett.
After a very close call on the Cambridgeshire Fens, Harriet White is about ready to hang up her deerstalker and settle back into her normal life, working in a bank on Baker Street. Until she discovers a letter in The Times newspaper challenging Sherlock Holmes to prove his status as the world’s greatest detective, by solving an impossible mystery. The letter, signed Professor James Moriarty, advises Holmes that the crime will be committed within the following seven days. There will be no further clues – Holmes himself must deduce which crime is the correct one to investigate.
Dismissing the letter as a prank, Harry goes about her business until news breaks of the theft of valuable jewel collection from a safe in an apparently locked room in a Mayfair townhouse.
Intrigued in spite of her misgivings, Harry dons a disguise and investigates. But as she begins to unpick the puzzle, a body is found. And now, a stranger, and far more deadly mystery begins to unfold around her...
After a very close call on the Cambridgeshire Fens, Harriet White is about ready to hang up her deerstalker and settle back into her normal life, working in a bank on Baker Street. Until she discovers a letter in The Times newspaper challenging Sherlock Holmes to prove his status as the world’s greatest detective, by solving an impossible mystery. The letter, signed Professor James Moriarty, advises Holmes that the crime will be committed within the following seven days. There will be no further clues – Holmes himself must deduce which crime is the correct one to investigate.
Dismissing the letter as a prank, Harry goes about her business until news breaks of the theft of valuable jewel collection from a safe in an apparently locked room in a Mayfair townhouse.
Intrigued in spite of her misgivings, Harry dons a disguise and investigates. But as she begins to unpick the puzzle, a body is found. And now, a stranger, and far more deadly mystery begins to unfold around her...
217 pages, Kindle Edition
Published January 20, 2026
48 people are currently reading
86 people want to read
About the author
Holly Hepburn
86 books421 followersI’ve wanted to write books for adults for as long as I can remember but I was too scared to try. One day I decided to be brave and dipped a toe into the bubble bath of romantic comedy with my first novella, Cupidity, and I’ve never looked back. I often try to be funny to be funny, except for when faced with traffic wardens and border control staff. My favourite thing is making people smile.
I’ve tried many jobs over the years, from barmaid to market researcher and I even had a brief flirtation with modelling. These days I am mostly found writing.
I live near London with my grey tabby cat, Portia. We both have an unhealthy obsession with Marmite.
I’ve tried many jobs over the years, from barmaid to market researcher and I even had a brief flirtation with modelling. These days I am mostly found writing.
I live near London with my grey tabby cat, Portia. We both have an unhealthy obsession with Marmite.
Ratings & Reviews
Friends & Following
Create a free account to discover what your friends think of this book!
Community Reviews
Displaying 1 - 30 of 73 reviews
January 26, 2026
Very good edition to this favorite series [of mine]. I just love Harry, her quick mind, and her empathy for those around her [this really shows up with Beth in this book], and her willingness to help those she can.
The mysteries are good [it was fun to have several irons in the fire in this one], the reveals [mostly] satisfactory, and the end good [poker anyone? IYKYK]. My only grumble is the possibility of a love triangle [which I DESPISE]. I can only hope Harry comes to her senses and squashes that nonsense quickly.
I am very much looking forward to book 4!!
Thank you to NetGalley, Holly Hepburn, and Boldwood Books for providing this ARC in exchange for an honest review.
The mysteries are good [it was fun to have several irons in the fire in this one], the reveals [mostly] satisfactory, and the end good [poker anyone? IYKYK]. My only grumble is the possibility of a love triangle [which I DESPISE]. I can only hope Harry comes to her senses and squashes that nonsense quickly.
I am very much looking forward to book 4!!
Thank you to NetGalley, Holly Hepburn, and Boldwood Books for providing this ARC in exchange for an honest review.
January 21, 2026
Before I even started this book, I just had to look up 50 Berkeley Square as the author suggested. Very interesting history and I also recommend looking it up before reading the book.
Now on to the book, which I had been looking forward to reading, having read book 2 in the series.
I enjoyed catching up with Harriet, known to all as Harry, as she reads an announcement in the newspaper addressed to Sherlock Holmes from someone calling themselves Moriarty. The letter invites Holmes to solve an impossible crime. Harry works for the Abbey bank which just happens to own property on Baker Street in London including that very famous address.
Harry’s job is to politely reply to the many letters they receive addressed to Holmes, pretending to be his secretary and advising he is now retired. Until she receives letters which intrigue her so much she actually decides to investigate, and the ‘real’ Holmes would be immensely proud of her. She is a very determined and capable young woman and, with the help of her friends, gets stuck in.
It turns out she has a few mysteries to solve in this outing, including one very close to home.
A clever cosy crime locked room mystery which I was completely immersed in, excellent descriptions placing the reader in the centre of the action in London and with some very memorable characters. Set in the 1930’s, it is interesting too from a historical point as we read about the role of women at the time, men’s clubs, underground gambling, and the huge gap between the wealthy and the poor.
There is also a potential romance for Harry, giving her more of a personality as I don’t feel we get to know much about the real Harry other than her family is wealthy but she likes to work and she lives alone. The book is all about solving the mysteries. Personally I’m not a fan of romance in my mysteries so this is just enough.
That is exactly the way to finish a book as I’m now very much looking forward to the next one!
Thank you to Rachel from Rachel’s Random Resources for my spot on the blog tour.
Now on to the book, which I had been looking forward to reading, having read book 2 in the series.
I enjoyed catching up with Harriet, known to all as Harry, as she reads an announcement in the newspaper addressed to Sherlock Holmes from someone calling themselves Moriarty. The letter invites Holmes to solve an impossible crime. Harry works for the Abbey bank which just happens to own property on Baker Street in London including that very famous address.
Harry’s job is to politely reply to the many letters they receive addressed to Holmes, pretending to be his secretary and advising he is now retired. Until she receives letters which intrigue her so much she actually decides to investigate, and the ‘real’ Holmes would be immensely proud of her. She is a very determined and capable young woman and, with the help of her friends, gets stuck in.
It turns out she has a few mysteries to solve in this outing, including one very close to home.
A clever cosy crime locked room mystery which I was completely immersed in, excellent descriptions placing the reader in the centre of the action in London and with some very memorable characters. Set in the 1930’s, it is interesting too from a historical point as we read about the role of women at the time, men’s clubs, underground gambling, and the huge gap between the wealthy and the poor.
There is also a potential romance for Harry, giving her more of a personality as I don’t feel we get to know much about the real Harry other than her family is wealthy but she likes to work and she lives alone. The book is all about solving the mysteries. Personally I’m not a fan of romance in my mysteries so this is just enough.
That is exactly the way to finish a book as I’m now very much looking forward to the next one!
Thank you to Rachel from Rachel’s Random Resources for my spot on the blog tour.
January 12, 2026
4.5 stars
This is the third in the Baker Street Mysteries series and it keeps getting better and better.
The Locked Room is slightly darker and much more tense than the others in the series but is such an entertaining mystery from Holly Hepburn.
I’m never sure whether to admire Harry or tell her to stop being so fool-hardy in her attempts to solve these mysteries. Her bravery and tenacity are certainly great traits but boy was this a mystery that could have ended rather differently.
I loved the idea of Moriarty being involved in this one - a nice link to the traditional tales of Holmes and Moriarty, it was fun seeing the cat and mouse games between them wound into Harry’s mystery.
This is certainly a tricky one for Harry to solve, and I loved seeing her once again with Oliver and Beth working hard to solve this mysterious puzzle.
This is the third in the Baker Street Mysteries series and it keeps getting better and better.
The Locked Room is slightly darker and much more tense than the others in the series but is such an entertaining mystery from Holly Hepburn.
I’m never sure whether to admire Harry or tell her to stop being so fool-hardy in her attempts to solve these mysteries. Her bravery and tenacity are certainly great traits but boy was this a mystery that could have ended rather differently.
I loved the idea of Moriarty being involved in this one - a nice link to the traditional tales of Holmes and Moriarty, it was fun seeing the cat and mouse games between them wound into Harry’s mystery.
This is certainly a tricky one for Harry to solve, and I loved seeing her once again with Oliver and Beth working hard to solve this mysterious puzzle.
February 21, 2026
Always fun, always compulsively readable! Harriet is such a likeable woman, and I love that we learnt more about her family and the people around her in this book. And of course, the introduction of the famous Moriarty! Can’t wait for the next one!
February 4, 2026
I adore these cozy mysteries and the Sherlock connection. It’s not the deepest or most complex story or writing but it is just fun!
January 21, 2026
Another fab instalment in this series, Harry White is a secretary who works at 221b Baker St (which is a bank) and spends her days replying to letters that have been sent to Sherlock Holmes. This time it isn’t a letter that grabs her interest but an ad in the agony column of The Times, goading Sherlock to play the game - signed by Moriarty!
Harry can’t get involved, but slowly but surely she gets pulled into the game after learning of a locked room theft - just the sort of crime Moriarty would plan. And yes, she gets her disguise on and gets involved. There are a few other side stories that grab her attention too, all intriguing as well.
I really like this series, and this was a brilliant story. I’m not sure I would have solved it, over time maybe. Looking forward to the next one already.
Harry can’t get involved, but slowly but surely she gets pulled into the game after learning of a locked room theft - just the sort of crime Moriarty would plan. And yes, she gets her disguise on and gets involved. There are a few other side stories that grab her attention too, all intriguing as well.
I really like this series, and this was a brilliant story. I’m not sure I would have solved it, over time maybe. Looking forward to the next one already.
Review of advance copy received from Netgalley
Book review: Holly Hepburn, The Locked Room.
Boldwood Books, with sincere thanks to the publisher and NetGalley for my gifted ARC.
There is something endlessly comforting about slipping back into Holly Hepburn’s version of 1930s London, and The Locked Room made me feel instantly at home. This is the third book in the Baker Street Mystery series, and while longtime readers will enjoy seeing familiar faces again, it also works beautifully as a standalone. From the very first chapter, I was reminded why this series is such a clever and cozy twist on classic detective fiction. Letters still arrive for Sherlock Holmes at Baker Street, and Harriet “Harry” White is the woman tasked with answering them. Except, of course, Harry has a habit of doing far more than replying politely.
This time, the mystery begins with a public provocation. A letter signed by “Professor Moriarty” appears in The Times, daring Sherlock Holmes to solve a crime that has not yet been committed. Harry dismisses it as a prank until a priceless diamond disappears from a safe in a Mayfair townhouse, a theft that appears impossible. The locked-room setup is irresistible, and Hepburn leans into it with confidence, giving readers a puzzle that feels fair, intriguing, and satisfyingly knotty without becoming overly complex.
What I love most about this series is the balance. Yes, there is danger, deception, and even murder, but the story never loses its warmth. Harry investigates in disguise, asks awkward questions, and follows her instincts even when common sense tells her to stop. Alongside the central mystery, there are family concerns, social expectations, and a gentle but persistent romantic undercurrent that adds emotional texture without overwhelming the plot. The personal stakes matter just as much as the crime, and that’s what makes this feel like more than just a puzzle to solve.
Hepburn’s writing is witty and smooth, with a light touch that keeps the pages turning. The historical setting feels natural rather than showy. I could picture the grand houses, the quieter streets, and the contrast between wealth and hardship in London at the time. Small details bring the era to life, and I appreciated how seamlessly they were woven into the story instead of being dropped in for effect.
Harry herself continues to be a standout protagonist. She’s clever but not infallible, brave without being reckless for the sake of it, and refreshingly human. I enjoyed watching her navigate expectations placed on her while quietly pushing against them. The supporting cast adds depth and charm, and I found myself genuinely invested in their lives as well as the mystery at hand.
“There’s something deeply satisfying about a mystery that invites you in, pours you a cup of tea, and then quietly pulls the rug out from under your feet.”
By the time I reached the final reveal, I was fully hooked. The solution made sense, the clues were there, and I immediately wanted to flip back and see how neatly everything had been laid out. The Locked Room is exactly what I want from a historical cozy mystery: smart, comforting, engaging, and just twisty enough to keep me guessing. Fans of Sherlock Holmes-inspired stories, locked-room mysteries, and character-driven historical fiction should absolutely add this to their reading list.
⭐️⭐️⭐️⭐️⭐️ 5 stars
#TheLockedRoom #HollyHepburn #BookReview #HistoricalMystery #CozyMystery #LockedRoomMystery #BakerStreetMystery #SherlockInspired #NetGalley #BoldwoodBooks #ARCReview
Boldwood Books, with sincere thanks to the publisher and NetGalley for my gifted ARC.
There is something endlessly comforting about slipping back into Holly Hepburn’s version of 1930s London, and The Locked Room made me feel instantly at home. This is the third book in the Baker Street Mystery series, and while longtime readers will enjoy seeing familiar faces again, it also works beautifully as a standalone. From the very first chapter, I was reminded why this series is such a clever and cozy twist on classic detective fiction. Letters still arrive for Sherlock Holmes at Baker Street, and Harriet “Harry” White is the woman tasked with answering them. Except, of course, Harry has a habit of doing far more than replying politely.
This time, the mystery begins with a public provocation. A letter signed by “Professor Moriarty” appears in The Times, daring Sherlock Holmes to solve a crime that has not yet been committed. Harry dismisses it as a prank until a priceless diamond disappears from a safe in a Mayfair townhouse, a theft that appears impossible. The locked-room setup is irresistible, and Hepburn leans into it with confidence, giving readers a puzzle that feels fair, intriguing, and satisfyingly knotty without becoming overly complex.
What I love most about this series is the balance. Yes, there is danger, deception, and even murder, but the story never loses its warmth. Harry investigates in disguise, asks awkward questions, and follows her instincts even when common sense tells her to stop. Alongside the central mystery, there are family concerns, social expectations, and a gentle but persistent romantic undercurrent that adds emotional texture without overwhelming the plot. The personal stakes matter just as much as the crime, and that’s what makes this feel like more than just a puzzle to solve.
Hepburn’s writing is witty and smooth, with a light touch that keeps the pages turning. The historical setting feels natural rather than showy. I could picture the grand houses, the quieter streets, and the contrast between wealth and hardship in London at the time. Small details bring the era to life, and I appreciated how seamlessly they were woven into the story instead of being dropped in for effect.
Harry herself continues to be a standout protagonist. She’s clever but not infallible, brave without being reckless for the sake of it, and refreshingly human. I enjoyed watching her navigate expectations placed on her while quietly pushing against them. The supporting cast adds depth and charm, and I found myself genuinely invested in their lives as well as the mystery at hand.
“There’s something deeply satisfying about a mystery that invites you in, pours you a cup of tea, and then quietly pulls the rug out from under your feet.”
By the time I reached the final reveal, I was fully hooked. The solution made sense, the clues were there, and I immediately wanted to flip back and see how neatly everything had been laid out. The Locked Room is exactly what I want from a historical cozy mystery: smart, comforting, engaging, and just twisty enough to keep me guessing. Fans of Sherlock Holmes-inspired stories, locked-room mysteries, and character-driven historical fiction should absolutely add this to their reading list.
⭐️⭐️⭐️⭐️⭐️ 5 stars
#TheLockedRoom #HollyHepburn #BookReview #HistoricalMystery #CozyMystery #LockedRoomMystery #BakerStreetMystery #SherlockInspired #NetGalley #BoldwoodBooks #ARCReview
December 18, 2025
First, I want to tell readers that such a job as held here by Harriet "Harry" White really did exist. Make sure you read the Author's Note before you dive into the book for more on that and some other relevant notes. Once you dive into the book, whether as a returning reader or a newbie, you're in for quite a ride. Harry, the grand-daughter of a baron, hardly fits the expected mold for women in 1930's London. She's smart, curious, independent, living on her own, and just can't resist answering the occasional letter herself as Holmes' assistant that she's been given to respond to for the fictional Sherlock Holmes and getting involved in investigating the "case". She's smart enough to know she doesn't have the latitude of Doyle's Holmes and can't do it all on her own. While not exactly fool hardy, she does seem to get herself into some tricky, dangerous situations, especially for a lady of her social status in England. Fortunately, she has two sleuthing buddies, with Beth playing a prominent and seemingly permanent role this go-round.
I don't want to dive too far into the plot as it'll be far more fun to discover it as you read but will say it starts with not a letter to Holmes but an advertisement/announcement in the newspaper from none other than Professor James Moriarty, Holmes nemesis. While assuming it's just a fun taunt, the game becomes deathly serious with not just the theft of a diamond but death. Watching Harry and Oliver, plus Beth, work their way through the clues and red herrings is fun and you'll get a tour of some old style gambling dens and underground London in the process. Harry is also trying to sort out her youngest brother Rufus' latest potential scandal, something that leads Harry into a side of London respectable young women didn't frequent. Wait to you see how she manages this. Oliver is right there beside her for much of this and has a few revelations of his own that startle Harry. Sometimes it's tough to disguise your feelings.
Okay, not saying much more other than that the visits themselves are wonderfully described and, oh, you will even get to experience a circus of the time. Cotton candy, anyone? I liked the characters and it was nice to get to know her brother Seb a bit better as well as Percy, Harry's mother's choice for a son-in-law. Oh, and Harry meets Scotland Yard's Inspector Wells, who you'll surely enjoy getting to know. The author does a great job setting the scene and I felt like I was right there with the characters on the streets and, well, elsewhere. As noted, the book works well as a standalone, so don't hesitate to jump in there. You'll be quickly caught up on the cast of characters and some of the social divisions of the time. The mystery is clever and, oh, so devious. Thanks #BoldwoodBooks and #NetGalley for this early peek back into time to catch up on Harry's life. The ending already has me ready for the next episode.
I don't want to dive too far into the plot as it'll be far more fun to discover it as you read but will say it starts with not a letter to Holmes but an advertisement/announcement in the newspaper from none other than Professor James Moriarty, Holmes nemesis. While assuming it's just a fun taunt, the game becomes deathly serious with not just the theft of a diamond but death. Watching Harry and Oliver, plus Beth, work their way through the clues and red herrings is fun and you'll get a tour of some old style gambling dens and underground London in the process. Harry is also trying to sort out her youngest brother Rufus' latest potential scandal, something that leads Harry into a side of London respectable young women didn't frequent. Wait to you see how she manages this. Oliver is right there beside her for much of this and has a few revelations of his own that startle Harry. Sometimes it's tough to disguise your feelings.
Okay, not saying much more other than that the visits themselves are wonderfully described and, oh, you will even get to experience a circus of the time. Cotton candy, anyone? I liked the characters and it was nice to get to know her brother Seb a bit better as well as Percy, Harry's mother's choice for a son-in-law. Oh, and Harry meets Scotland Yard's Inspector Wells, who you'll surely enjoy getting to know. The author does a great job setting the scene and I felt like I was right there with the characters on the streets and, well, elsewhere. As noted, the book works well as a standalone, so don't hesitate to jump in there. You'll be quickly caught up on the cast of characters and some of the social divisions of the time. The mystery is clever and, oh, so devious. Thanks #BoldwoodBooks and #NetGalley for this early peek back into time to catch up on Harry's life. The ending already has me ready for the next episode.
January 21, 2026
Locked-room mysteries are my absolute weakness, so I was already inclined to be generous with The Locked Room. Add in a female sleuth, a Sherlock-adjacent premise, and 1930s London, and I was fully on board before the first page. What I did not expect was how thoroughly this book would delight me—or how quickly I’d be buying the first two installments in the series for pure, unapologetic pleasure.
The Locked Room drops us back into Harriet White’s world after a near-fatal case on the Norfolk Fens. Harriet is ready to retreat to the relative safety of her bank job on Baker Street, until a provocative letter appears in The Times, publicly challenging Sherlock Holmes to solve an “impossible” crime in seven days. When a jewel theft from a supposedly locked Mayfair room hits the headlines, Harriet’s curiosity—and sense of justice—prove impossible to ignore.
I jumped into this series with book three and never felt lost, which is no small feat. Hepburn provides just enough grounding to orient new readers while rewarding longtime fans with deeper character beats. I was also intrigued to learn that the premise draws inspiration from a real historical incident, which adds an extra frisson to the cleverness of the setup.
Hepburn’s writing is witty, assured, and inviting, with a light touch that keeps the pages turning. The historical setting feels lived-in rather than performative. I could see the grand townhouses, the quieter streets, and the sharp contrast between wealth and hardship in interwar London. Period details are woven in naturally, never paraded for effect, which makes the world feel solid and breathable.
This particular mystery unfolds around a snowbound manor and delivers one of the most satisfying locked-room puzzles I’ve read in years. False identities, impossible footprints, and a wonderfully human subplot involving Harriet’s mischievous younger brother keep both the tension and the charm dialed high. Hepburn’s prose is richly evocative; the chill of the house, the glow of firelight, and the small rituals of comfort feel almost tangible, even as the tension tightens and the stakes rise.
The twists genuinely surprised me. The romantic thread simmers gently without ever hijacking the mystery. When the final reveal landed, I actually gasped—then immediately flipped back to earlier chapters to admire how skillfully I’d been misdirected.
The Locked Room is clever, cozy without being complacent, and deeply satisfying for puzzle-lovers. If you adore classic detective fiction but crave a fresh perspective, Harriet White deserves a place on your shelf—and very likely, in your reading rotation for a long while to come.
Goes well with: a blazing fire, a generous glass of brandy, and the delicious certainty that you’re about to be very cleverly fooled.
The Locked Room drops us back into Harriet White’s world after a near-fatal case on the Norfolk Fens. Harriet is ready to retreat to the relative safety of her bank job on Baker Street, until a provocative letter appears in The Times, publicly challenging Sherlock Holmes to solve an “impossible” crime in seven days. When a jewel theft from a supposedly locked Mayfair room hits the headlines, Harriet’s curiosity—and sense of justice—prove impossible to ignore.
I jumped into this series with book three and never felt lost, which is no small feat. Hepburn provides just enough grounding to orient new readers while rewarding longtime fans with deeper character beats. I was also intrigued to learn that the premise draws inspiration from a real historical incident, which adds an extra frisson to the cleverness of the setup.
Hepburn’s writing is witty, assured, and inviting, with a light touch that keeps the pages turning. The historical setting feels lived-in rather than performative. I could see the grand townhouses, the quieter streets, and the sharp contrast between wealth and hardship in interwar London. Period details are woven in naturally, never paraded for effect, which makes the world feel solid and breathable.
This particular mystery unfolds around a snowbound manor and delivers one of the most satisfying locked-room puzzles I’ve read in years. False identities, impossible footprints, and a wonderfully human subplot involving Harriet’s mischievous younger brother keep both the tension and the charm dialed high. Hepburn’s prose is richly evocative; the chill of the house, the glow of firelight, and the small rituals of comfort feel almost tangible, even as the tension tightens and the stakes rise.
The twists genuinely surprised me. The romantic thread simmers gently without ever hijacking the mystery. When the final reveal landed, I actually gasped—then immediately flipped back to earlier chapters to admire how skillfully I’d been misdirected.
The Locked Room is clever, cozy without being complacent, and deeply satisfying for puzzle-lovers. If you adore classic detective fiction but crave a fresh perspective, Harriet White deserves a place on your shelf—and very likely, in your reading rotation for a long while to come.
Goes well with: a blazing fire, a generous glass of brandy, and the delicious certainty that you’re about to be very cleverly fooled.
January 14, 2026
📚The Locked Room
✍🏻Holly Hepburn
Blurb:
The BRAND NEW instalment in Holly Hepburn's Baker Street Mystery series - for fans of Sherlock Holmes! Join Harriet White in 1930's London for another glorious Sherlock Holmes-inspired mystery, for fans of Nita Prose and Janice Hallett.
After a very close call on the Cambridgeshire Fens, Harriet White is about ready to hang up her deerstalker and settle back into her normal life, working in a bank on Baker Street. Until she discovers a letter in The Times newspaper challenging Sherlock Holmes to prove his status as the world’s greatest detective, by solving an impossible mystery. The letter, signed Professor James Moriarty, advises Holmes that the crime will be committed within the following seven days. There will be no further clues – Holmes himself must deduce which crime is the correct one to investigate.
Dismissing the letter as a prank, Harry goes about her business until news breaks of the theft of valuable jewel collection from a safe in an apparently locked room in a Mayfair townhouse.
Intrigued in spite of her misgivings, Harry dons a disguise and investigates. But as she begins to unpick the puzzle, a body is found. And now, a stranger, and far more deadly mystery begins to unfold around her...
My Thoughts:
The Locked Room is the third book in the Baker Street Mysteries, Harriet, has two mysteries to solve in this latest book: determining the identity of her younger brother's intended future wife and the theft of a priceless gem from a safe in a locked room. This series is such a clever and cozy twist on classic detective fiction. There is danger, deception, and even murder, but the story never loses its warmth. Harriet White is quickly becoming a heroine to root for—resourceful, curious, and just a little daring. Our main character, Harriet, has two mysteries to solve in this latest book: determining the identity of her younger brother's intended future wife and the theft of a priceless gem from a safe in a locked room. The twin mysteries unfold side by side and lead Harriet to some interesting locations. Harry is a wonderful character, and I also love Harry's new rough-around-the-edges partner, Beth. And then there is Harry's will they love interest.I enjoyed the book and would recommend to those who loves mysteries.
Thanks NetGalley, Boldwood Books and Author Holly Hepburn for the advanced copy of "The Locked Room" I am leaving my voluntary review in appreciation.
#NetGalley
#BoldwoodBooks
#HollyHepburn
#TheLockedRoom
⭐️⭐️⭐️⭐️
✍🏻Holly Hepburn
Blurb:
The BRAND NEW instalment in Holly Hepburn's Baker Street Mystery series - for fans of Sherlock Holmes! Join Harriet White in 1930's London for another glorious Sherlock Holmes-inspired mystery, for fans of Nita Prose and Janice Hallett.
After a very close call on the Cambridgeshire Fens, Harriet White is about ready to hang up her deerstalker and settle back into her normal life, working in a bank on Baker Street. Until she discovers a letter in The Times newspaper challenging Sherlock Holmes to prove his status as the world’s greatest detective, by solving an impossible mystery. The letter, signed Professor James Moriarty, advises Holmes that the crime will be committed within the following seven days. There will be no further clues – Holmes himself must deduce which crime is the correct one to investigate.
Dismissing the letter as a prank, Harry goes about her business until news breaks of the theft of valuable jewel collection from a safe in an apparently locked room in a Mayfair townhouse.
Intrigued in spite of her misgivings, Harry dons a disguise and investigates. But as she begins to unpick the puzzle, a body is found. And now, a stranger, and far more deadly mystery begins to unfold around her...
My Thoughts:
The Locked Room is the third book in the Baker Street Mysteries, Harriet, has two mysteries to solve in this latest book: determining the identity of her younger brother's intended future wife and the theft of a priceless gem from a safe in a locked room. This series is such a clever and cozy twist on classic detective fiction. There is danger, deception, and even murder, but the story never loses its warmth. Harriet White is quickly becoming a heroine to root for—resourceful, curious, and just a little daring. Our main character, Harriet, has two mysteries to solve in this latest book: determining the identity of her younger brother's intended future wife and the theft of a priceless gem from a safe in a locked room. The twin mysteries unfold side by side and lead Harriet to some interesting locations. Harry is a wonderful character, and I also love Harry's new rough-around-the-edges partner, Beth. And then there is Harry's will they love interest.I enjoyed the book and would recommend to those who loves mysteries.
Thanks NetGalley, Boldwood Books and Author Holly Hepburn for the advanced copy of "The Locked Room" I am leaving my voluntary review in appreciation.
#NetGalley
#BoldwoodBooks
#HollyHepburn
#TheLockedRoom
⭐️⭐️⭐️⭐️
Review of advance copy received from Netgalley
3.7 Stars
One Liner: A short and quick read
1930s London
Harriet White thinks she has had enough of mysteries and is happy to get back to her job answering letters at the bank on Baker Street. Then, one day, The Times carries an ad signed Professor James Moriarty, challenging Holmes to solve a crime that would happen in the next seven days.
Harriet thinks it’s just a joke until a valuable jewel collection is stolen from a safe in a Mayfair townhouse. Intrigued, she pokes around only to end up with a dead body in her hands. Now, Harriet has to solve the cases while ensuring she stays alive long enough for it!
The story comes in Harriet’s third-person POV.
My Thoughts
As the third book in the series, this can work as a standalone, but I recommend reading at least one of the previous two for a better idea of the characters.
This has a main mystery and a subplot, which is helpful. Though it is a short read, the main mystery is a bit simple (no less dangerous), so having more than one aspect to focus on is a good idea. That said, I wish it was also fleshed out a little more.
Since it is a cozy mystery, there are enough lighthearted moments with some danger and drama mixed in. I like the statement about a detective being written to be the smartest and the near impossibility of trying to replicate the same in real life (though this book is also fiction).
There’s also a teeny progress in the personal/ overarching plot (the FMC’s life). I hope it won’t turn into a full-fledged love triangle or a messy miscommunication tangle (I hate both). For now, it shows the FMC’s characterization—a naïve but determined young woman with a yearning to be seen as something other than a sheltered daughter of a Baron. Since I already know who to root for, I want the other guy to be out of the picture as soon as possible.
To summarize, The Locked Room is an enjoyable read you can finish in a couple of hours or so. Pick it up when you want something light and easy with a mystery thrown in.
Thank you, NetGalley and Boldwood Books, for the eARC. This review is voluntary and contains my honest opinion about the book.
#NetGalley #TheLockedRoom
One Liner: A short and quick read
1930s London
Harriet White thinks she has had enough of mysteries and is happy to get back to her job answering letters at the bank on Baker Street. Then, one day, The Times carries an ad signed Professor James Moriarty, challenging Holmes to solve a crime that would happen in the next seven days.
Harriet thinks it’s just a joke until a valuable jewel collection is stolen from a safe in a Mayfair townhouse. Intrigued, she pokes around only to end up with a dead body in her hands. Now, Harriet has to solve the cases while ensuring she stays alive long enough for it!
The story comes in Harriet’s third-person POV.
My Thoughts
As the third book in the series, this can work as a standalone, but I recommend reading at least one of the previous two for a better idea of the characters.
This has a main mystery and a subplot, which is helpful. Though it is a short read, the main mystery is a bit simple (no less dangerous), so having more than one aspect to focus on is a good idea. That said, I wish it was also fleshed out a little more.
Since it is a cozy mystery, there are enough lighthearted moments with some danger and drama mixed in. I like the statement about a detective being written to be the smartest and the near impossibility of trying to replicate the same in real life (though this book is also fiction).
There’s also a teeny progress in the personal/ overarching plot (the FMC’s life). I hope it won’t turn into a full-fledged love triangle or a messy miscommunication tangle (I hate both). For now, it shows the FMC’s characterization—a naïve but determined young woman with a yearning to be seen as something other than a sheltered daughter of a Baron. Since I already know who to root for, I want the other guy to be out of the picture as soon as possible.
To summarize, The Locked Room is an enjoyable read you can finish in a couple of hours or so. Pick it up when you want something light and easy with a mystery thrown in.
Thank you, NetGalley and Boldwood Books, for the eARC. This review is voluntary and contains my honest opinion about the book.
#NetGalley #TheLockedRoom
Review of advance copy received from Netgalley
📱📖 Read on Kindle
📃 217 pages
⏱ ~4 hours
🏷️ Publisher: Boldwood Books
📅 Release Date: January 20, 2026
✨ ARC provided by NetGalley
Harriet White is back, and so, technically, is Sherlock Holmes. Still working in her modest Baker Street office, answering letters meant for the world’s most famous detective, Harry once again stumbles into a mystery she absolutely cannot ignore. This time, though, the stakes feel sharper. Moriarty is writing to her. Moriarty. And suddenly the lines between fiction, legacy, and very real danger begin to blur in the most delicious way.
Holly Hepburn nails the historical cozy mystery feel. 1930s London comes alive with foggy streets, clever disguises, and that ever-present sense of Baker Street magic. Harry's growth shines; she's sharper, more conflicted about her double life, and the Moriarty correspondence adds delicious psychological tension. The locked-room setup is clever (no easy answers), and the shift from theft to murder ramps up the drama without losing the cozy charm. Fans of Sherlock Holmes pastiches will love the respectful nods to canon while Hepburn carves her own path. It's twisty, atmospheric, and just twisty enough to feel fresh.
What I appreciated most is how confidently this book inhabits its literary inheritance. Hepburn doesn’t just reference Conan Doyle; she understands the appeal for the atmosphere, intellect, psychological sparring, and translates it for a modern historical mystery reader. This series just keeps deepening the emotional undercurrent of Harry’s loyalty to Holmes, her self-doubt, and her dogged intelligence make her feel like someone you’d happily follow through every cobbled street and hidden alley London has to offer.
Would I recommend it?
Absolutely. Hepburn’s The Locked Room is a confident, clever, and deeply satisfying addition to the Baker Street Mysteries. It scratches that Sherlock itch while carving its own distinct mark.
What’s Your Favorite Sherlock Spin?
Harry White keeps Holmes alive in her own way, but who’s your favorite modern take on the detective? Drop your picks (and theories about Moriarty!) in the comments. I love discovering new Holmes-inspired stories.
📃 217 pages
⏱ ~4 hours
🏷️ Publisher: Boldwood Books
📅 Release Date: January 20, 2026
✨ ARC provided by NetGalley
Harriet White is back, and so, technically, is Sherlock Holmes. Still working in her modest Baker Street office, answering letters meant for the world’s most famous detective, Harry once again stumbles into a mystery she absolutely cannot ignore. This time, though, the stakes feel sharper. Moriarty is writing to her. Moriarty. And suddenly the lines between fiction, legacy, and very real danger begin to blur in the most delicious way.
Holly Hepburn nails the historical cozy mystery feel. 1930s London comes alive with foggy streets, clever disguises, and that ever-present sense of Baker Street magic. Harry's growth shines; she's sharper, more conflicted about her double life, and the Moriarty correspondence adds delicious psychological tension. The locked-room setup is clever (no easy answers), and the shift from theft to murder ramps up the drama without losing the cozy charm. Fans of Sherlock Holmes pastiches will love the respectful nods to canon while Hepburn carves her own path. It's twisty, atmospheric, and just twisty enough to feel fresh.
What I appreciated most is how confidently this book inhabits its literary inheritance. Hepburn doesn’t just reference Conan Doyle; she understands the appeal for the atmosphere, intellect, psychological sparring, and translates it for a modern historical mystery reader. This series just keeps deepening the emotional undercurrent of Harry’s loyalty to Holmes, her self-doubt, and her dogged intelligence make her feel like someone you’d happily follow through every cobbled street and hidden alley London has to offer.
Would I recommend it?
Absolutely. Hepburn’s The Locked Room is a confident, clever, and deeply satisfying addition to the Baker Street Mysteries. It scratches that Sherlock itch while carving its own distinct mark.
What’s Your Favorite Sherlock Spin?
Harry White keeps Holmes alive in her own way, but who’s your favorite modern take on the detective? Drop your picks (and theories about Moriarty!) in the comments. I love discovering new Holmes-inspired stories.
January 20, 2026
I am enjoying this mystery series immensely, as it has the perfect balance of paying homage to the original Sherlock Holmes stories by Sir Arthur Conan Doyle, while also bringing fresh characters, new plots and a more modern style. I definitely recommend reading the books in order (this one is number three) as certain characters recur and there is an overall story building behind the stand-alone cases, as evidenced by the challenge issued at the start of this latest instalment.
Harry and her faithful Watson, Oliver, unite once again to investigate a classic locked-room theft at the taunting of their very own Moriarty. But when a body turns up as well, things take a turn for the perilous and anyone connected to our intrepid sleuths could be in the firing line.
Harry’s previous informant Beth takes a more prominent role in the story and it was lovely to see Harry finally having a female friend to confide in and investigate with – someone as brave and intelligent as herself but with different skills and experience to bring to the detecting table. And we see a bit more of Harry’s family too, specifically her brothers, as a personal entanglement requires a bit of investigating on the side!
As usual, disguises, deductions and danger ensue, as Harry once again throws herself into defying society’s norms and Oliver’s cautious nature for the greater – and her own personal – good. And speaking of ‘personal’, certain potential romantic sparks are beginning to kindle here and although none actually develops into a full flame there is plenty of heat and friction (all very chaste and mostly respectable, of course!).
This is another clever and satisfying classic-style mystery with convincing, engaging characters, and touches of wit and romance amid the investigatory fun. Definitely a series to follow for fellow mystery fans – a respectful tribute to the great detective but fresh and entertaining in its own right too.
Harry and her faithful Watson, Oliver, unite once again to investigate a classic locked-room theft at the taunting of their very own Moriarty. But when a body turns up as well, things take a turn for the perilous and anyone connected to our intrepid sleuths could be in the firing line.
Harry’s previous informant Beth takes a more prominent role in the story and it was lovely to see Harry finally having a female friend to confide in and investigate with – someone as brave and intelligent as herself but with different skills and experience to bring to the detecting table. And we see a bit more of Harry’s family too, specifically her brothers, as a personal entanglement requires a bit of investigating on the side!
As usual, disguises, deductions and danger ensue, as Harry once again throws herself into defying society’s norms and Oliver’s cautious nature for the greater – and her own personal – good. And speaking of ‘personal’, certain potential romantic sparks are beginning to kindle here and although none actually develops into a full flame there is plenty of heat and friction (all very chaste and mostly respectable, of course!).
This is another clever and satisfying classic-style mystery with convincing, engaging characters, and touches of wit and romance amid the investigatory fun. Definitely a series to follow for fellow mystery fans – a respectful tribute to the great detective but fresh and entertaining in its own right too.
January 22, 2026
Come along on a charming mystery with a plucky young heroine, nefarious villains, and just a hint of romance!
Though I haven't read the previous in this series, I enjoyed this entry as it follows Harry White - granddaughter of a baron who works as Sherlock Homes' secretary - knowing, of course, that Holmes is fictional, her role to let hopefuls know that the great detective has retired. What her bosses can't know is that every now and then, Harry solves the mystery instead. When a challenge to Holmes from his literary nemesis Moriarty is placed in the papers, Harry soon realises that her recent successes (from earlier books) have attracted the notice of shadowy figures, and someone wants to know who has been solving crimes under the name of Sherlock Holmes.
Harry is a classic heroine - adventurous, headstrong, and insightful - but I also appreciated her kindness and how she didn't make stupid decisions in the name of furthering the plot. Now, she might be a little bit oblivious to romance, but even clever people have blind spots. She is surrounded by an interesting cast of characters - few enough to keep track of but not so many as to be confusing. I liked her burgeoning friendship with Beth, and do I sense a possible frisson between Beth and Harry's brother?
The mystery was clever, not immediately obvious but believably twisty. Careening from the townhouses to the underground clubs and back again, this was a great way to spend an evening and I hope Harry's adventures continue!
Disclaimer: I received a copy of this book via Rachel's Random Resources; all opinions and words are my own. For more reviews, check out my blog!
Though I haven't read the previous in this series, I enjoyed this entry as it follows Harry White - granddaughter of a baron who works as Sherlock Homes' secretary - knowing, of course, that Holmes is fictional, her role to let hopefuls know that the great detective has retired. What her bosses can't know is that every now and then, Harry solves the mystery instead. When a challenge to Holmes from his literary nemesis Moriarty is placed in the papers, Harry soon realises that her recent successes (from earlier books) have attracted the notice of shadowy figures, and someone wants to know who has been solving crimes under the name of Sherlock Holmes.
Harry is a classic heroine - adventurous, headstrong, and insightful - but I also appreciated her kindness and how she didn't make stupid decisions in the name of furthering the plot. Now, she might be a little bit oblivious to romance, but even clever people have blind spots. She is surrounded by an interesting cast of characters - few enough to keep track of but not so many as to be confusing. I liked her burgeoning friendship with Beth, and do I sense a possible frisson between Beth and Harry's brother?
The mystery was clever, not immediately obvious but believably twisty. Careening from the townhouses to the underground clubs and back again, this was a great way to spend an evening and I hope Harry's adventures continue!
Disclaimer: I received a copy of this book via Rachel's Random Resources; all opinions and words are my own. For more reviews, check out my blog!
December 10, 2025
I’d never picked up a Holly Hepburn book before The Locked Room. Three days later I was bleary-eyed, ignoring my family, and completely obsessed. This book swallowed me whole—I kept sneaking pages at red lights and muttering “just one more chapter” until the wee hours. Even though it’s the third in the series, I never felt lost; old characters pop in like welcome friends, but the story stands beautifully on its own. (That said, I’ve already ordered books one and two because I need more Harry White in my life immediately.)
Imagine a love letter to Sherlock Holmes that somehow feels fresh: real letters still arrive at 221B Baker Street, and clever, fiercely independent Harriet “Harry” White secretly investigates them in Holmes’s name. This time a newspaper dare drags her to a snowbound manor for the most delicious locked-room puzzle I’ve read in years, complete with false identities, impossible footprints, and a subplot about her mischievous little brother that had me grinning even while my pulse raced. Hepburn’s prose is witty, warm, and so evocative I could smell the woodsmoke and taste the brandy. The twists genuinely surprised me, the romance simmers without ever overwhelming the mystery, and the final reveal left me gasping then immediately rereading chapters to see how brilliantly she’d fooled me. If you love Golden Age crime with modern heart—or if you just want to fall hopelessly in love with a stubborn, brilliant heroine—this is your next can’t-put-it-down read. It’s elementary: five stars and zero regrets.
Appreciative thanks to NetGalley, the author, and the publisher for providing me with an advanced digital copy in exchange for an honest review.
Imagine a love letter to Sherlock Holmes that somehow feels fresh: real letters still arrive at 221B Baker Street, and clever, fiercely independent Harriet “Harry” White secretly investigates them in Holmes’s name. This time a newspaper dare drags her to a snowbound manor for the most delicious locked-room puzzle I’ve read in years, complete with false identities, impossible footprints, and a subplot about her mischievous little brother that had me grinning even while my pulse raced. Hepburn’s prose is witty, warm, and so evocative I could smell the woodsmoke and taste the brandy. The twists genuinely surprised me, the romance simmers without ever overwhelming the mystery, and the final reveal left me gasping then immediately rereading chapters to see how brilliantly she’d fooled me. If you love Golden Age crime with modern heart—or if you just want to fall hopelessly in love with a stubborn, brilliant heroine—this is your next can’t-put-it-down read. It’s elementary: five stars and zero regrets.
Appreciative thanks to NetGalley, the author, and the publisher for providing me with an advanced digital copy in exchange for an honest review.
Review of advance copy received from Netgalley
Netgalley Review
The writing was light and engaging. I was entertained from the beginning right through to the end.
The chapters were long and occasionally split. This meant that we got a good chunk of the story before moving on. There was quite a lot of information that we were presented with, including a couple of different things that the main character was looking into, but I managed to keep up. It all came together well at the end.
There was a good flow between the chapters so I was happy to sit and read the story for long periods of time.
There was a good pace to the book despite the long chapters and the amount of information that we were given. There were little time and event jumps that kept the story moving forward well. I was certainly kept on my toes!
The characters were great. I loved following the main character around London and felt immediately transported to the 1930s with the limited options that she had as an upper class woman. It was interesting to see how she used her male relative and friends' stations in order to get the information that she wanted. It was also interesting to see how she also used the lower class characters to get her information from other places that as an upper class citizen she was unable to frequent herself. All of the information was gathered well and tied up neatly at the end. I would quite happily read more about all of the characters.
Lastly the settings. I enjoyed being in 1930s London. There were some lovely little details that really added to the story.
Overall an excellent mystery that I highly recommend. Perfect for any Sherlock Holmes fan who enjoys a twist on the original series.
The writing was light and engaging. I was entertained from the beginning right through to the end.
The chapters were long and occasionally split. This meant that we got a good chunk of the story before moving on. There was quite a lot of information that we were presented with, including a couple of different things that the main character was looking into, but I managed to keep up. It all came together well at the end.
There was a good flow between the chapters so I was happy to sit and read the story for long periods of time.
There was a good pace to the book despite the long chapters and the amount of information that we were given. There were little time and event jumps that kept the story moving forward well. I was certainly kept on my toes!
The characters were great. I loved following the main character around London and felt immediately transported to the 1930s with the limited options that she had as an upper class woman. It was interesting to see how she used her male relative and friends' stations in order to get the information that she wanted. It was also interesting to see how she also used the lower class characters to get her information from other places that as an upper class citizen she was unable to frequent herself. All of the information was gathered well and tied up neatly at the end. I would quite happily read more about all of the characters.
Lastly the settings. I enjoyed being in 1930s London. There were some lovely little details that really added to the story.
Overall an excellent mystery that I highly recommend. Perfect for any Sherlock Holmes fan who enjoys a twist on the original series.
January 31, 2026
Witty, twisty and utterly satisfying, this series just keeps levelling up.
By the time you reach The Locked Room, it is impossible not to feel like you are coming home to a cast of friends you already adore, and in this third outing, Holly Hepburn proves yet again that she knows exactly how to raise both the emotional and mystery stakes.
This instalment delivers so many of the moments I have been quietly hoping for. There is a long-awaited admission of love that lands with just the right mix of tenderness and relief, the appearance of a certain Inspector of Police I have been eager to see make an appearance in a historical novel, and the arrival of a much needed “sidekick” who adds sparkle, warmth and a touch of delightful chaos to the mix. These characters feel beautifully settled now, as if the series has found its most confident rhythm.
The mystery itself is deliciously playful, weaving in the legendary name of Sherlock Holmes through a maze of disguises, secrets and clever trickery. The locked room puzzle keeps you guessing, but it never overwhelms the heart of the story. Instead, the plot and the relationships dance together, each one making the other richer and more rewarding.
What I love most is how each book in this series somehow manages to be better than the last. The world feels deeper, the stakes feel higher, and the emotional payoffs feel earned. The Locked Room is clever, charming and quietly thrilling, the kind of story that makes you want to curl up and read just one more chapter, and then another.
My thanks go to Netgalley and Boldwood Books for the ARC of this book.
By the time you reach The Locked Room, it is impossible not to feel like you are coming home to a cast of friends you already adore, and in this third outing, Holly Hepburn proves yet again that she knows exactly how to raise both the emotional and mystery stakes.
This instalment delivers so many of the moments I have been quietly hoping for. There is a long-awaited admission of love that lands with just the right mix of tenderness and relief, the appearance of a certain Inspector of Police I have been eager to see make an appearance in a historical novel, and the arrival of a much needed “sidekick” who adds sparkle, warmth and a touch of delightful chaos to the mix. These characters feel beautifully settled now, as if the series has found its most confident rhythm.
The mystery itself is deliciously playful, weaving in the legendary name of Sherlock Holmes through a maze of disguises, secrets and clever trickery. The locked room puzzle keeps you guessing, but it never overwhelms the heart of the story. Instead, the plot and the relationships dance together, each one making the other richer and more rewarding.
What I love most is how each book in this series somehow manages to be better than the last. The world feels deeper, the stakes feel higher, and the emotional payoffs feel earned. The Locked Room is clever, charming and quietly thrilling, the kind of story that makes you want to curl up and read just one more chapter, and then another.
My thanks go to Netgalley and Boldwood Books for the ARC of this book.
Review of advance copy received from Netgalley
The Locked Room is a sparkling new instalment in Holly Hepburn’s Baker Street Mystery series, and it’s every bit as atmospheric and clever as fans could hope for. Set in 1930s London, it captures the glamour and grit of the era while weaving a mystery that feels both classic and fresh.
Harriet White is quickly becoming a heroine to root for—resourceful, curious, and just a little daring. Her discovery of a letter in The Times, signed by none other than Professor Moriarty, sets the stage for a deliciously Holmes-inspired puzzle. When a diamond disappears from a locked room and a body soon follows, Harriet finds herself drawn deeper into a case that brims with intrigue, danger, and wit.
Hepburn’s writing balances charm with suspense beautifully. The locked-room setup is handled with flair, and the disguises, clues, and twists all nod to Sherlock Holmes while giving Harriet her own distinctive voice. The London backdrop adds richness, from the bustle of Baker Street to the elegance of Mayfair, making the mystery feel immersive and alive.
The Locked Room is a delightful blend of cozy mystery and classic whodunnit, perfect for fans of Helena Dixon, Nita Prose, and Janice Hallett. It’s witty, atmospheric, and full of heart—a story that proves Harriet White is more than capable of carrying the mantle of Baker Street’s mysteries.
My thanks to Holly Hepburn, the publisher and netgalley for the ARC
Harriet White is quickly becoming a heroine to root for—resourceful, curious, and just a little daring. Her discovery of a letter in The Times, signed by none other than Professor Moriarty, sets the stage for a deliciously Holmes-inspired puzzle. When a diamond disappears from a locked room and a body soon follows, Harriet finds herself drawn deeper into a case that brims with intrigue, danger, and wit.
Hepburn’s writing balances charm with suspense beautifully. The locked-room setup is handled with flair, and the disguises, clues, and twists all nod to Sherlock Holmes while giving Harriet her own distinctive voice. The London backdrop adds richness, from the bustle of Baker Street to the elegance of Mayfair, making the mystery feel immersive and alive.
The Locked Room is a delightful blend of cozy mystery and classic whodunnit, perfect for fans of Helena Dixon, Nita Prose, and Janice Hallett. It’s witty, atmospheric, and full of heart—a story that proves Harriet White is more than capable of carrying the mantle of Baker Street’s mysteries.
My thanks to Holly Hepburn, the publisher and netgalley for the ARC
Review of advance copy received from Netgalley
The Locked Room is the third book in the Baker Street Mysteries, and I've read them all. While it is not necessary to have read the previous two books in the series, there are some threads that readers might miss if they begin with book 3 (and, of course, they will be missing out on the fun of reading the series from the beginning).
Our main character, Harriet, has two mysteries to solve in this latest book: determining the identity of her younger brother's intended future wife and the theft of a priceless gem from a safe in a locked room. The twin mysteries unfold side by side and lead Harriet to some interesting locations.
What I really adore about this series of books is just how 'Sherlock Holmes' like they are - even the mysteries ring with familiarity from the Holmes stories, and yet are firmly placed in the 1930s. Harriet also interacts with the other characters in a way that feels very true to the time period. As much as we might not like it, she does have to masquerade in men's clothing, and she does need the help of her male friend to get into all the places she needs to visit. The Locked Room is also as twisty as the previous two books.
Another fab mystery, thoroughly enjoyable, ripe with the smell of 1930s London, and very Holmes-eque in its resolution as well as the mystery itself.
Our main character, Harriet, has two mysteries to solve in this latest book: determining the identity of her younger brother's intended future wife and the theft of a priceless gem from a safe in a locked room. The twin mysteries unfold side by side and lead Harriet to some interesting locations.
What I really adore about this series of books is just how 'Sherlock Holmes' like they are - even the mysteries ring with familiarity from the Holmes stories, and yet are firmly placed in the 1930s. Harriet also interacts with the other characters in a way that feels very true to the time period. As much as we might not like it, she does have to masquerade in men's clothing, and she does need the help of her male friend to get into all the places she needs to visit. The Locked Room is also as twisty as the previous two books.
Another fab mystery, thoroughly enjoyable, ripe with the smell of 1930s London, and very Holmes-eque in its resolution as well as the mystery itself.
Review of advance copy received from Netgalley
I thank NetGalley and Boldwood Books for an advance reader copy of The Locked Room. All opinions and comments are my own.
The third book in the “Baker Street Mysteries” series finds Harriet “Harry” White puzzling her way through the theft of a priceless missing diamond, the involvement of a shady pawnbroker and the connection to roving circus performers. It’s enough to set even the legendary Sherlock Holmes back a step or two. But with the help of her chums Oliver Fortesque and Beth Chamberlain, Harry is determined to do her best to find the diamond and hopefully figure out who is sending her cryptic letters posing as Holmes’ most diabolical enemy. What starts out as a robbery becomes a deadly game, and author Holly Hepburn has her plot well in hand. There’s even time to get Harry involved in getting her brother Seb out of a sticky marital situation.
Oliver and Harry outwit the bad’uns, and dear Oliver makes it clear that his heart has been quite captivated by the fetching Miss White. But Harry’s got some thinking to do. Will the steadfast Oliver be enough, or will the exciting Percy Finchem keep making her heart flutter? And whomever has decided to masquerade as Professor Moriarity has more in store for Sherlock Holmes’ “secretary.” Plenty to look forward to in the next installment.
The third book in the “Baker Street Mysteries” series finds Harriet “Harry” White puzzling her way through the theft of a priceless missing diamond, the involvement of a shady pawnbroker and the connection to roving circus performers. It’s enough to set even the legendary Sherlock Holmes back a step or two. But with the help of her chums Oliver Fortesque and Beth Chamberlain, Harry is determined to do her best to find the diamond and hopefully figure out who is sending her cryptic letters posing as Holmes’ most diabolical enemy. What starts out as a robbery becomes a deadly game, and author Holly Hepburn has her plot well in hand. There’s even time to get Harry involved in getting her brother Seb out of a sticky marital situation.
Oliver and Harry outwit the bad’uns, and dear Oliver makes it clear that his heart has been quite captivated by the fetching Miss White. But Harry’s got some thinking to do. Will the steadfast Oliver be enough, or will the exciting Percy Finchem keep making her heart flutter? And whomever has decided to masquerade as Professor Moriarity has more in store for Sherlock Holmes’ “secretary.” Plenty to look forward to in the next installment.
December 6, 2025
Several years ago, I had read that a long time ago, a bank had bought the property with the famous Baker Street address of Sherlock Holmes. But that is not the news. The bank employed someone to answer the mail that came in addressed to the famous detective. According to the author, Holly Hepburn, that was a practice that continued until the early 2000s.
Why does this matter? Because Ms. Hepburn has come up with an incredible premise for a series. What if the person answering the mail addressed to the fictitious Sherlock Holmes actually started investigating (and solving) the cases that were mailed to the bank. “The Locked Room” is the 3rd book in the series.
Harriet “Harry” White and her ragtag group do just that. They solve cases in the name of Sherlock Holmes. And the winner, those that read the series.
Now, don’t assume these are just cute, throw-away cozies. The mystery is worthy of the great detective. The writing is superb. The characters enjoyable.
I thought it was a fun premise. I found myself fully engrossed in the novel. If you are a fan of Sherlock Holmes, or dare I say great mysteries, this book is for you. It’s elementary.
Thank you to NetGalley and the Publisher for providing an ARC for an unbiased review.
December 27, 2025
The Locked Room is the third installment in Holly Hepburn’s series, and while it didn’t quite reach the highs of the earlier books for me, it was still a pleasant and engaging read. Hepburn’s writing remains warm, accessible, and comforting, making this a book that’s easy to settle into—even during a reading slump.
The story continues to build on familiar characters and settings, offering a sense of continuity that longtime readers of the series will appreciate. While the plot felt quieter and less stimulating than the first two books, it still held my attention better than several other recent reads, which speaks to Hepburn’s ability to create an inviting narrative flow.
This installment leans more toward gentle progression than dramatic momentum, focusing on atmosphere, relationships, and small emotional shifts rather than high-stakes tension. For readers who enjoy character-driven stories and a softer pace, this will still feel like a comforting return to a familiar world.
Overall, The Locked Room may not be the strongest entry in the series, but it’s a solid and enjoyable continuation—one that will likely appeal most to fans already invested in these characters and their journeys.
Thanks to Netgalley and Boldwood books for this ARC, this is my honest review.
The story continues to build on familiar characters and settings, offering a sense of continuity that longtime readers of the series will appreciate. While the plot felt quieter and less stimulating than the first two books, it still held my attention better than several other recent reads, which speaks to Hepburn’s ability to create an inviting narrative flow.
This installment leans more toward gentle progression than dramatic momentum, focusing on atmosphere, relationships, and small emotional shifts rather than high-stakes tension. For readers who enjoy character-driven stories and a softer pace, this will still feel like a comforting return to a familiar world.
Overall, The Locked Room may not be the strongest entry in the series, but it’s a solid and enjoyable continuation—one that will likely appeal most to fans already invested in these characters and their journeys.
Thanks to Netgalley and Boldwood books for this ARC, this is my honest review.
January 20, 2026
The Locked Room by Holly Hepburn
I received an advance review copy for free thanks to Rachel's Random Resources and I am leaving this review voluntarily.
Blurb
After a very close call on the Cambridgeshire Fens, Harriet White is about ready to hang up her deerstalker and settle back into her normal life, working in a bank on Baker Street. Until she discovers a letter in The Times newspaper challenging Sherlock Holmes to prove his status as the world’s greatest detective, by solving an impossible mystery. The letter, signed Professor James Moriarty, advises Holmes that the crime will be committed within the following seven days. There will be no further clues – Holmes himself must deduce which crime is the correct one to investigate.
Dismissing the letter as a prank, Harry goes about her business until news breaks of the theft of valuable jewel collection from a safe in an apparently locked room in a Mayfair townhouse.
Intrigued in spite of her misgivings, Harry dons a disguise and investigates. But as she begins to unpick the puzzle, a body is found. And now, a stranger, and far more deadly mystery begins to unfold around her...
My Opinion
The Locked Room is the third book in The Baker Street Mysteries series. Holly Hepburn has written a novel that was quick to read and difficult to put down. A cosy mystery with some lovely characters.
Rating 4/5
I received an advance review copy for free thanks to Rachel's Random Resources and I am leaving this review voluntarily.
Blurb
After a very close call on the Cambridgeshire Fens, Harriet White is about ready to hang up her deerstalker and settle back into her normal life, working in a bank on Baker Street. Until she discovers a letter in The Times newspaper challenging Sherlock Holmes to prove his status as the world’s greatest detective, by solving an impossible mystery. The letter, signed Professor James Moriarty, advises Holmes that the crime will be committed within the following seven days. There will be no further clues – Holmes himself must deduce which crime is the correct one to investigate.
Dismissing the letter as a prank, Harry goes about her business until news breaks of the theft of valuable jewel collection from a safe in an apparently locked room in a Mayfair townhouse.
Intrigued in spite of her misgivings, Harry dons a disguise and investigates. But as she begins to unpick the puzzle, a body is found. And now, a stranger, and far more deadly mystery begins to unfold around her...
My Opinion
The Locked Room is the third book in The Baker Street Mysteries series. Holly Hepburn has written a novel that was quick to read and difficult to put down. A cosy mystery with some lovely characters.
Rating 4/5
March 4, 2026
A priceless red diamond goes missing from a locked room and Moriarty issues a challenge to Sherlock Holmes...
The Locked Room is the 3rd book in Baker Street Mysteries featuring secretary Harriet (Harry White) who responds to Sherlock Holmes' post but can’t resist some investigations of her own.
Harry is intrigued by the mystery of the stolen red diamond goes missing but she has her own personal issue with a potential gold digger trying to ensnare her brother Rufus. Along with Oliver Fortescue, Harry sets about trying to resolve both problems.
The series is set in 1933 and there are some spoilers about earlier books and characters who feature again. Given the era, Harry has to deal with constricting social norms for class and gender but she is remarkably headstrong and dives straight into the investigation.
I felt like there was more personal stuff than actual case in the first half of book but this allowed for more exploration of Harry's character and relationships. I was willing for her and Oliver to give in to the spark between them (no spoilers if they do or not...!) The plot then shifts to focus more upon the missing diamond and the tension mounts as danger looms.
The Locked Room is an enjoyable historical mystery.
The Locked Room is the 3rd book in Baker Street Mysteries featuring secretary Harriet (Harry White) who responds to Sherlock Holmes' post but can’t resist some investigations of her own.
Harry is intrigued by the mystery of the stolen red diamond goes missing but she has her own personal issue with a potential gold digger trying to ensnare her brother Rufus. Along with Oliver Fortescue, Harry sets about trying to resolve both problems.
The series is set in 1933 and there are some spoilers about earlier books and characters who feature again. Given the era, Harry has to deal with constricting social norms for class and gender but she is remarkably headstrong and dives straight into the investigation.
I felt like there was more personal stuff than actual case in the first half of book but this allowed for more exploration of Harry's character and relationships. I was willing for her and Oliver to give in to the spark between them (no spoilers if they do or not...!) The plot then shifts to focus more upon the missing diamond and the tension mounts as danger looms.
The Locked Room is an enjoyable historical mystery.
January 21, 2026
In her basement office within the Baker Street Building Society, Harriet (Harry) White responds to letters addressed to Sherlock Holmes. Spotting something in The Times that challenges her fictional hero to prove his worth, propels Harry on a mission to locate the mystery writer, who titles himself Professor Moriarty. The theft of a priceless diamond suggests ‘Moriarty’ has committed a crime but is it a joke or is the thief trying to unmask Harry’s secret role as Sherlock’s assistant?
This is the second book I’ve read by this author (the first being The Cursed Writer), and it gets off to an interesting start. Along with her pal Oliver (who she has an enormous crush on), and her friend Beth, Harry utilises several ploys to track down the missing diamond and unmask the mysterious Moriarty. Dressing up as a man and investigating the house next to the one where the theft occurred, Harry finds herself in the middle of a real locked room mystery that appears to have no solution.
This was an interesting and entertaining read, though it didn’t hold my attention quite as much as the first book.
This is the second book I’ve read by this author (the first being The Cursed Writer), and it gets off to an interesting start. Along with her pal Oliver (who she has an enormous crush on), and her friend Beth, Harry utilises several ploys to track down the missing diamond and unmask the mysterious Moriarty. Dressing up as a man and investigating the house next to the one where the theft occurred, Harry finds herself in the middle of a real locked room mystery that appears to have no solution.
This was an interesting and entertaining read, though it didn’t hold my attention quite as much as the first book.
January 30, 2026
Thank you so much to NetGalley and Holly Hepburn for providing me with a complimentary digital ARC of The Locked Room, due for publication on January 20, 2026. All opinions expressed in this review are my own.
I really enjoyed this installment in the Baker Street Mysteries and now feel very motivated to go back and read the earlier books in the series. The Sherlock Holmes inspiration is such a fun and clever angle, and the locked room mystery at the heart of this story was exactly the kind of puzzle I love. There is something especially satisfying about an apparently impossible crime, and this one kept me engaged from start to finish.
Despite being a shorter read, the story felt complete and well paced. Harriet is a likable and engaging protagonist, and I enjoyed following her thought process as she worked through the mystery. The Holmes references add charm without overpowering the story, making this feel both familiar and fresh at the same time.
Overall, this was an enjoyable and cozy mystery that delivered exactly what I was hoping for. I had a great time reading it and would happily pick up more books by Holly Hepburn, both in this series and beyond.
I really enjoyed this installment in the Baker Street Mysteries and now feel very motivated to go back and read the earlier books in the series. The Sherlock Holmes inspiration is such a fun and clever angle, and the locked room mystery at the heart of this story was exactly the kind of puzzle I love. There is something especially satisfying about an apparently impossible crime, and this one kept me engaged from start to finish.
Despite being a shorter read, the story felt complete and well paced. Harriet is a likable and engaging protagonist, and I enjoyed following her thought process as she worked through the mystery. The Holmes references add charm without overpowering the story, making this feel both familiar and fresh at the same time.
Overall, this was an enjoyable and cozy mystery that delivered exactly what I was hoping for. I had a great time reading it and would happily pick up more books by Holly Hepburn, both in this series and beyond.
December 8, 2025
This is a delightful historical mystery with a great protagonist - Harry White, an independent young woman in 1930s London whose job is answering the many letters to Sherlock Holmes received at the bank located where 221B Baker Street would be. This is the third book in the series, but read well as stand alone. The references to the earlier books were good for setting the background without being tedious or confusing.
In the previous books, it appears Harry would occasionally deviate from the standard response (that Sherlock Holmes was retired) and would answer in the role of Sherlock Holmes' assistant offering to take the case. In this book, Harry is pressured by her family to investigate the mysterious woman her brother is planning on eloping with, intrigued by a jewel theft from a locked room, and drawn to a challenge in the newspaper by a person calling themself Moriarty.
I received this from NetGalley and am grateful to the author and publisher for the opportunity to read this in exchange for an honest review.
In the previous books, it appears Harry would occasionally deviate from the standard response (that Sherlock Holmes was retired) and would answer in the role of Sherlock Holmes' assistant offering to take the case. In this book, Harry is pressured by her family to investigate the mysterious woman her brother is planning on eloping with, intrigued by a jewel theft from a locked room, and drawn to a challenge in the newspaper by a person calling themself Moriarty.
I received this from NetGalley and am grateful to the author and publisher for the opportunity to read this in exchange for an honest review.
Review of advance copy received from Netgalley
This is the third book in "The Baker Street Mysteries" in which Harriet ("Harry") White is the person responsible for answering all the letters addressed to the fictional Sherlock Holmes at 221b. In this book Harry isn't following up on one of the letters begging Holmes' help, but rather a challenge in the newspaper "agony column" addressed to Sherlock Holmes from his arch-rival Moriarty. Since neither of these characters really exists, someone must be sending this message to Harry. And she dives right in with the help of her lawyer friend Oliver, her undercover person Beth, and a bit of Scotland Yard. Disguises and Speakeasys are involved!
I loved this book even more than the previous two, even though it didn't directly involve her job at the bank answering letters. The main characters are likable and believable. The plot is finely crafted and held my interest from beginning to end.
I highly recommend this new series as the author has shown much skill in weaving interesting mysteries.
I obtained an advance copy of this book via NetGalley.
I loved this book even more than the previous two, even though it didn't directly involve her job at the bank answering letters. The main characters are likable and believable. The plot is finely crafted and held my interest from beginning to end.
I highly recommend this new series as the author has shown much skill in weaving interesting mysteries.
I obtained an advance copy of this book via NetGalley.
Review of advance copy received from Netgalley
Here we go again, Harry! Harriet White is still working in the post room of a building society at 221B Baker Street and still secretly responds to letters addressed to the fictional Sherlock Holmes. She may have taken it a wee bit farther in The Locked Room, however...
What is Harry to do when a letter appears in The Times from someone claiming to be Professor James Moriarty, who challenges Holmes to solve an "impossible crime" that will occur within a week? That would be everything she CAN do, including donning a disguise so she can pass herself as a man!
I think Harry is a wonderful character, and I also love Harry's new rough-around-the-edges partner, Beth. And then there is Harry's will-they-or-won't-they love interest. The Locked Room is a great addition to The Baker Street Mysteries series!
BIG thanks to #BoldwoodBooks, for providing this book for consideration and review via #NetGalley. All opinions are my own. The Locked Room has an expected publication date of January 20, 2026.
#HollyHepburn #Mystery #HistoricalFiction #Series
What is Harry to do when a letter appears in The Times from someone claiming to be Professor James Moriarty, who challenges Holmes to solve an "impossible crime" that will occur within a week? That would be everything she CAN do, including donning a disguise so she can pass herself as a man!
I think Harry is a wonderful character, and I also love Harry's new rough-around-the-edges partner, Beth. And then there is Harry's will-they-or-won't-they love interest. The Locked Room is a great addition to The Baker Street Mysteries series!
BIG thanks to #BoldwoodBooks, for providing this book for consideration and review via #NetGalley. All opinions are my own. The Locked Room has an expected publication date of January 20, 2026.
#HollyHepburn #Mystery #HistoricalFiction #Series
Review of advance copy received from Netgalley
Thanks to NetGalley for the ARC of this.
This series of 'period-set cosy crime' novels are pleasantly jolly with neat plots and reasonably convincing period detail (I am, as established, extremely picky about period detail). Hepburn does plenty of research and I'm always confident that her depictions of the London of the early 1930s is effective.
This is the ideal book for this time of year, the post-Xmas slump - a nicely paced mystery with good character development from the previous books and some enjoyable returning characters. Harry is a fun protagonist with useful connections who can help her in her investigations.
I'm not 100% convinced by the dialogue, I feel that Harry (a member of the minor aristocracy) would have been considerably posher than, eg, Harriet Vane (a doctor's daughter), who is herself extremely RP, but she isn't. However I agree this is basically nitpicking and won't concern most readers! (Also, I think when you rang people in the early 30s you had to deal with the operator, and the call was 'put through'. But again, this is nitpicking.)
This series of 'period-set cosy crime' novels are pleasantly jolly with neat plots and reasonably convincing period detail (I am, as established, extremely picky about period detail). Hepburn does plenty of research and I'm always confident that her depictions of the London of the early 1930s is effective.
This is the ideal book for this time of year, the post-Xmas slump - a nicely paced mystery with good character development from the previous books and some enjoyable returning characters. Harry is a fun protagonist with useful connections who can help her in her investigations.
I'm not 100% convinced by the dialogue, I feel that Harry (a member of the minor aristocracy) would have been considerably posher than, eg, Harriet Vane (a doctor's daughter), who is herself extremely RP, but she isn't. However I agree this is basically nitpicking and won't concern most readers! (Also, I think when you rang people in the early 30s you had to deal with the operator, and the call was 'put through'. But again, this is nitpicking.)
Displaying 1 - 30 of 73 reviews