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Rollback
Rollback
—
A riveting new series from the bestselling author of the Breakthrough series
—
Under a light rain, Mike Mansfield stands stoically beneath a large tree, waiting patiently for the person he has been searching for. Burly and in his mid-fifties, Mansfield was what some might call chaotically good – a person with an unshakable sense of right and wrong, and his own unique brand of justice.
However, what Mansfield doesn’t know is that after years of working in the shadows, someone has now found him. And they have been watching Mansfield for some time.
That person is David Bruni. A man with the means to do something truly groundbreaking with modern technology. He too has been working in secret… to build a supercomputer capable of ‘stitching’ together the billions of pictures taken every day to create snapshots of the world at any given time.
The capability proves to be extraordinary, and one that has coincidentally revealed to Bruni the secret behind Mike Mansfield’s enigmatic success at finding people nobody else can. A well-kept secret that absolutely no one would have expected.
Yet it’s not until a third critical piece appears, a young INTERPOL agent named Leslie Salazar, that Bruni’s true reason for creating his incredible system finally becomes clear.
Under a light rain, Mike Mansfield stands stoically beneath a large tree, waiting patiently for the person he has been searching for. Burly and in his mid-fifties, Mansfield was what some might call chaotically good – a person with an unshakable sense of right and wrong, and his own unique brand of justice.
However, what Mansfield doesn’t know is that after years of working in the shadows, someone has now found him. And they have been watching Mansfield for some time.
That person is David Bruni. A man with the means to do something truly groundbreaking with modern technology. He too has been working in secret… to build a supercomputer capable of ‘stitching’ together the billions of pictures taken every day to create snapshots of the world at any given time.
The capability proves to be extraordinary, and one that has coincidentally revealed to Bruni the secret behind Mike Mansfield’s enigmatic success at finding people nobody else can. A well-kept secret that absolutely no one would have expected.
Yet it’s not until a third critical piece appears, a young INTERPOL agent named Leslie Salazar, that Bruni’s true reason for creating his incredible system finally becomes clear.
352 pages, Kindle Edition
Published July 15, 2025
1870 people are currently reading
3589 people want to read
About the author
Michael C. Grumley
18 books1,318 followersMichael C. Grumley is the author of the best-selling BREAKTHROUGH series with over two million books sold. He lives in Northern California with his two young daughters. He’s an avid reader, runner and most of all father, and dotes on his girls every chance he gets. He loves hearing from readers while he works on the next ROLLBACK book.
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Displaying 1 - 30 of 112 reviews
July 26, 2025
Wow, as usual, Mr. Grumley brings it all to the read! I love how he has incorporated "the invisibles" into his writing - such an unseen asset by most of the world!
This had me on the edge of my seat, reading far too fast as I could not put it down, then relieved at the end to know there will be more to come from these characters :) Bring it on! 🙏
This had me on the edge of my seat, reading far too fast as I could not put it down, then relieved at the end to know there will be more to come from these characters :) Bring it on! 🙏
February 9, 2026
Right, so I initially gave this four stars and figured I'd move on. Then the bastard thing refused to leave my brain. Months later I'm still thinking about it - not the characters, not the plot beats, but the core idea that Grumley's built everything around. And that sticky quality, that ability to haunt you long after you've forgotten the specifics? That counts for something serious.
Grumley writes like someone who's read every airport thriller ever published and then thought "okay but what if the surveillance state actually won." It's got that propulsive crime-novel pacing (tight, efficient, zero fat) but layered with near-future tech that feels close enough to be genuinely unnerving. The speculative core isn't flashy. It's not time travel or aliens. It's just... what if the cameras already see everything and we're only now realising what that means.
The plot moves like a proper thriller should. International intrigue, shadowy power plays, twists that land because Grumley's structured it well. Characters are functional rather than deep - the specialist's competent, the genius is appropriately brilliant and morally flexible, everyone else does their job without demanding much attention. Normally I'd complain about that, but here it works. You're not here for psychological depth. You're here because the ideas are doing violence to your sense of privacy and the future.
Six months on, I keep circling back to it. Every time I see another headline about facial recognition or data aggregation or AI ethics, there's this quiet "oh fuck" moment where I remember Grumley got there first and made it feel inevitable. It's the sneaky kind of book that grows in your head after you've finished, which is exactly what good speculative fiction should do.
Perfect for anyone who lives in crime novels but wants a sci-fi edge without committing to full genre deep-dive.
Quietly ambitious, deeply satisfying, and better the longer it sits with you. I was an idiot the first time around. This one's a keeper.
Grumley writes like someone who's read every airport thriller ever published and then thought "okay but what if the surveillance state actually won." It's got that propulsive crime-novel pacing (tight, efficient, zero fat) but layered with near-future tech that feels close enough to be genuinely unnerving. The speculative core isn't flashy. It's not time travel or aliens. It's just... what if the cameras already see everything and we're only now realising what that means.
The plot moves like a proper thriller should. International intrigue, shadowy power plays, twists that land because Grumley's structured it well. Characters are functional rather than deep - the specialist's competent, the genius is appropriately brilliant and morally flexible, everyone else does their job without demanding much attention. Normally I'd complain about that, but here it works. You're not here for psychological depth. You're here because the ideas are doing violence to your sense of privacy and the future.
Six months on, I keep circling back to it. Every time I see another headline about facial recognition or data aggregation or AI ethics, there's this quiet "oh fuck" moment where I remember Grumley got there first and made it feel inevitable. It's the sneaky kind of book that grows in your head after you've finished, which is exactly what good speculative fiction should do.
Perfect for anyone who lives in crime novels but wants a sci-fi edge without committing to full genre deep-dive.
Quietly ambitious, deeply satisfying, and better the longer it sits with you. I was an idiot the first time around. This one's a keeper.
August 10, 2025
Talk about resonating in today's world...
This reads as smooth as his Breakthrough series, which you need to read if this is your first experience reading Michael Grumley, and just as mind-bending. He's so good at writing things calmly, while still taking you on a heart-stopping read that you can't put down. The intelligence level at which he writes clues you in on his ability to harness his own knowledge and keep you believing in what's possible in this world!
This reads as smooth as his Breakthrough series, which you need to read if this is your first experience reading Michael Grumley, and just as mind-bending. He's so good at writing things calmly, while still taking you on a heart-stopping read that you can't put down. The intelligence level at which he writes clues you in on his ability to harness his own knowledge and keep you believing in what's possible in this world!
December 20, 2025
This book was such an unbelievably pleasant surprise!
I'm not even sure why this surprises me because so far, everything that I have read by Mr. Grumley has been a joyous success. This book though, takes his expertise at character development, then adds in a crazy, interesting mystery and then to top things off.....ramps up the tension and action level to the point that I found myself holding my breath at certain parts.
DEFINITE WINNER!!!
This series introduces us to MMC Mike Mansfield. He is a successful investigator who finds lost people - manly children. He has seen the worst that the world can do, and he is still adamant in trying to do his part to save that one person. He is also a vigilante. Yes, he finds the missing. But, if he can also catch the perpetrators, he gives the decision on their punishment to the fathers of the victims. To make the choice on how to handle the punishment of the men that hurt their daughters. Emotional? You better believe it.
Mansfield also uses a fantastic team that he calls the "invisibles". These are older individuals who have been successful at their vocations in their lifetime. But now that they are senior citizens, the world tends to not see them anymore. So....if they are invisible, he decides to utilize their expertise and experience to his advantage. It is an awesome success.
This case takes us on a journey as we follow Mansfield as he takes on a 4 year old case of the missing daughter of a billionaire tech mogul. It does not take long for him to realize that things are not what they seem, and the original investigations went in the complete wrong direction.
This is only the first book in this series and their is going to be another book out in the next month or so.
I can't wait.
I'm not even sure why this surprises me because so far, everything that I have read by Mr. Grumley has been a joyous success. This book though, takes his expertise at character development, then adds in a crazy, interesting mystery and then to top things off.....ramps up the tension and action level to the point that I found myself holding my breath at certain parts.
DEFINITE WINNER!!!
This series introduces us to MMC Mike Mansfield. He is a successful investigator who finds lost people - manly children. He has seen the worst that the world can do, and he is still adamant in trying to do his part to save that one person. He is also a vigilante. Yes, he finds the missing. But, if he can also catch the perpetrators, he gives the decision on their punishment to the fathers of the victims. To make the choice on how to handle the punishment of the men that hurt their daughters. Emotional? You better believe it.
Mansfield also uses a fantastic team that he calls the "invisibles". These are older individuals who have been successful at their vocations in their lifetime. But now that they are senior citizens, the world tends to not see them anymore. So....if they are invisible, he decides to utilize their expertise and experience to his advantage. It is an awesome success.
This case takes us on a journey as we follow Mansfield as he takes on a 4 year old case of the missing daughter of a billionaire tech mogul. It does not take long for him to realize that things are not what they seem, and the original investigations went in the complete wrong direction.
This is only the first book in this series and their is going to be another book out in the next month or so.
I can't wait.
July 26, 2025
C.E.W.
Really enjoyed this book. Not what I was expecting. The characters were amazing and relatable. I'm one of the invisible people out there, so nice to know we have our own super power. Great read Michael C. Grumley, so looking forward to book #2 and beyond.
Really enjoyed this book. Not what I was expecting. The characters were amazing and relatable. I'm one of the invisible people out there, so nice to know we have our own super power. Great read Michael C. Grumley, so looking forward to book #2 and beyond.
July 26, 2025
New Concept
Love the concept, the characters, the possibility for new adventures. Really great job. Looking forward to the next Mansfield retribution, intriguing tech, and story.
Love the concept, the characters, the possibility for new adventures. Really great job. Looking forward to the next Mansfield retribution, intriguing tech, and story.
July 25, 2025
great book
You have no idea where this book is going at the start, which makes the story even more interesting. Great book and great writer. All of his books are well worth reading.
You have no idea where this book is going at the start, which makes the story even more interesting. Great book and great writer. All of his books are well worth reading.
July 24, 2025
Great mix of technology and thrill.
Grumley does not disappoint! This story pits interesting technology against the dark underbelly of society. The technology is artificial intelligence. The underbelly is human trafficking. Buckle up for quite a ride!
Grumley does not disappoint! This story pits interesting technology against the dark underbelly of society. The technology is artificial intelligence. The underbelly is human trafficking. Buckle up for quite a ride!
July 21, 2025
Rollback is fantastic!
Author Michael C. Grumley has another winner adventure thriller story on his hands! Great characters, fast-moving action; I gobbled up Rollback and am hungry for more. Type faster Michael!
Author Michael C. Grumley has another winner adventure thriller story on his hands! Great characters, fast-moving action; I gobbled up Rollback and am hungry for more. Type faster Michael!
July 18, 2025
Very intriguing
This was a bit darker story than I’m used to, but good at gently describing a horrific problem growing in our society. Trafficking! Probably something we should all be paying more attention to. It’s hard, but necessary if we are going to effect a solution. Read it! Put yourself in those shoes! Strongly recommend.
This was a bit darker story than I’m used to, but good at gently describing a horrific problem growing in our society. Trafficking! Probably something we should all be paying more attention to. It’s hard, but necessary if we are going to effect a solution. Read it! Put yourself in those shoes! Strongly recommend.
Read
July 20, 2025HIGHLY RECOMMEND- Great Read!
This book was fast-paced from the jump. It kept me engaged throughout the entire read. The characters were 3 dimensional, meaning they felt really like i wanted to invite over for dinner or just to hang out. Never saw the ending. Im not a tech person, but I found this invention fascinating and was able to follow the tech talk (it was minimal, but even minimal tech talk usually leaves my brain scrambled. Didn't want to put it down and felt a hole in my day when I finished it.
This book was fast-paced from the jump. It kept me engaged throughout the entire read. The characters were 3 dimensional, meaning they felt really like i wanted to invite over for dinner or just to hang out. Never saw the ending. Im not a tech person, but I found this invention fascinating and was able to follow the tech talk (it was minimal, but even minimal tech talk usually leaves my brain scrambled. Didn't want to put it down and felt a hole in my day when I finished it.
November 26, 2025
I like this book, and this author. I found the story interesting, and the idea of capturing screenshots and videos from everyone around the world not that big a stretch into science fiction. The facial recognition they describe is already here, and I suspect police departments are further along than we know in being able to stich together videos from the different Ring doorbell cameras in the neighborhood than we realize. I liked Mike Mansfield and his team of "Invisibles", although I can't believe there could ever really be that many around the world that are all connected and available at a moment's notice. In my experience, getting tickets to fly team members all over instantly would never happen.
I found a couple of things the author described in the book to be totally unrealistic. When they went in to the bar/restaurant in Antigua they saw bags of wheat and corn. I have never seen bags of wheat or corn in a restaurant (or home for that matter) in my life. During the chase scene, the author describes the sedan repeatedly ramming the old pickup that Mike was driving. Know old pickups and sedans, after the first ramming, the car would be out of commission with a broken radiator and probably a seized engine while the pickup probably wouldn't have had more than some sheet metal damage to the truck bed. Repeated ramming, and the ability of the sedan to actually flip the pickup on its side seem highly unlikely.
I listened to the audio version and have one comment to make about that. I absolutely HATE listening to Scott Brick's narration. His over-dramatization of absolutely everything really gets on my nerves. I don't think he could order oatmeal for breakfast without drama. Unfortunately, he is the narrator for a large number of thriller/spy novel type books so hearing him is almost unavoidable. There are so many excellent narrators out there that I wish they had chosen someone else.
I found a couple of things the author described in the book to be totally unrealistic. When they went in to the bar/restaurant in Antigua they saw bags of wheat and corn. I have never seen bags of wheat or corn in a restaurant (or home for that matter) in my life. During the chase scene, the author describes the sedan repeatedly ramming the old pickup that Mike was driving. Know old pickups and sedans, after the first ramming, the car would be out of commission with a broken radiator and probably a seized engine while the pickup probably wouldn't have had more than some sheet metal damage to the truck bed. Repeated ramming, and the ability of the sedan to actually flip the pickup on its side seem highly unlikely.
I listened to the audio version and have one comment to make about that. I absolutely HATE listening to Scott Brick's narration. His over-dramatization of absolutely everything really gets on my nerves. I don't think he could order oatmeal for breakfast without drama. Unfortunately, he is the narrator for a large number of thriller/spy novel type books so hearing him is almost unavoidable. There are so many excellent narrators out there that I wish they had chosen someone else.
September 20, 2025
This book was a thoughtful recommendation from my Grammy, and I’m glad I gave it a chance. Rollback isn’t my usual kind of read, but it carried a theme that really stuck with me: the idea that later years in life don’t mean a withdrawal from purpose or meaningful contribution. Instead, older folks are given a chance to step back into impactful work—sometimes even on the grandest, most world-shaping scale.
The story blends science fiction with very human questions about aging, identity, and what it means to remain relevant as the world changes around you. I found the concept touching: people in their twilight years being called upon, and trusted, to bring wisdom and perspective to challenges that matter.
While the pacing and genre might not normally draw me in, I appreciated reading it through the lens of my Grammy’s recommendation. It made me reflect on how much value exists in the lived experiences of older generations, and how easily that can be overlooked.
In short, Rollback reminded me that even outside my usual reading preferences, there’s a lot to gain from stepping into someone else’s world—whether that’s a fictional character’s, or the perspective of someone you love and respect.
The story blends science fiction with very human questions about aging, identity, and what it means to remain relevant as the world changes around you. I found the concept touching: people in their twilight years being called upon, and trusted, to bring wisdom and perspective to challenges that matter.
While the pacing and genre might not normally draw me in, I appreciated reading it through the lens of my Grammy’s recommendation. It made me reflect on how much value exists in the lived experiences of older generations, and how easily that can be overlooked.
In short, Rollback reminded me that even outside my usual reading preferences, there’s a lot to gain from stepping into someone else’s world—whether that’s a fictional character’s, or the perspective of someone you love and respect.
August 22, 2025
the story was interesting, but if you don't have a solid base of techno-geek sciences or computer-nerd language and data systems, good luck with all the parsing of digital images, the painting of data systems and the scaping of intelligence from photo sources other than what is right in front of you, specifically in your own hands.
I got lost so many times in the back and forth of who was doing what to the data and ultimately, controlling the actual action in the book, that the story began to fade and the tech overtook my simple mind.
I'm a Google user. A g-mail and YT sort of dabbler, and by no means do I understand any of that stuff. Looking, or trying to look, beyond all the yada-yada-yada of screen systems language I just found the story failed to launch for me.
Not saying it wasn't an interesting book, but I won't do follow on if this is the overall speed the author wants readers to possess.
I got lost so many times in the back and forth of who was doing what to the data and ultimately, controlling the actual action in the book, that the story began to fade and the tech overtook my simple mind.
I'm a Google user. A g-mail and YT sort of dabbler, and by no means do I understand any of that stuff. Looking, or trying to look, beyond all the yada-yada-yada of screen systems language I just found the story failed to launch for me.
Not saying it wasn't an interesting book, but I won't do follow on if this is the overall speed the author wants readers to possess.
August 26, 2025
Very Creative
Three young girls on vacation in the Caribbean are having a great time. Until they aren't... and only two get on the return flight home. I don't usually read 'thrillers' but I genuinely enjoyed this book. I liked the use of technology and AI and how they were woven into the plot, also not something I usually enjoy. I'm definitely not a tech savvy person at all, believe me, so there was just enough of it to make it plausible but not so that it's dry and has me go glassy eyed and put the book down. (I have pre-ordered the next book by Grumley with the same main character and his "group of friends". So there's that) Mike, the protagonist, is a kind of guy " with a certain set of skills" and a dry sense of humour that a few of his associates share. The author gives the reader the respect of not beating us over the head with his characters traits, it's nuanced and believable. Characters are fleshed out and the plot is fast paced and engrossing. A good read.
Three young girls on vacation in the Caribbean are having a great time. Until they aren't... and only two get on the return flight home. I don't usually read 'thrillers' but I genuinely enjoyed this book. I liked the use of technology and AI and how they were woven into the plot, also not something I usually enjoy. I'm definitely not a tech savvy person at all, believe me, so there was just enough of it to make it plausible but not so that it's dry and has me go glassy eyed and put the book down. (I have pre-ordered the next book by Grumley with the same main character and his "group of friends". So there's that) Mike, the protagonist, is a kind of guy " with a certain set of skills" and a dry sense of humour that a few of his associates share. The author gives the reader the respect of not beating us over the head with his characters traits, it's nuanced and believable. Characters are fleshed out and the plot is fast paced and engrossing. A good read.
August 23, 2025
Holy AARP!
A complete 360 degree turn from your previous books. Mansfield, Hurd, Wanda and the rest off the "invisibles" with their varied talents are a force to be reckoned with! I was immersed in the storyline of how Mansfield and his Crew utilized their resources to assist their "new" client/contacts to locate Bruni's daughter with the assistance of Salazar and The Rollback Machine's technology. The Rollback Machines technology is both inspiring and frightening. Oh, the possibilities of teetering on they precipice of altering Good v. Evil, while patching and piecing together a cornucopia of photographs and digital media with the help of the World' best kept secret. Will the Rollback Machine's glitch be a blessing or a curse?!?! A perfect ending and set-up for The Mirage. I'm a fan of this new cast of characters and their exploits/mission!
Charlie
A complete 360 degree turn from your previous books. Mansfield, Hurd, Wanda and the rest off the "invisibles" with their varied talents are a force to be reckoned with! I was immersed in the storyline of how Mansfield and his Crew utilized their resources to assist their "new" client/contacts to locate Bruni's daughter with the assistance of Salazar and The Rollback Machine's technology. The Rollback Machines technology is both inspiring and frightening. Oh, the possibilities of teetering on they precipice of altering Good v. Evil, while patching and piecing together a cornucopia of photographs and digital media with the help of the World' best kept secret. Will the Rollback Machine's glitch be a blessing or a curse?!?! A perfect ending and set-up for The Mirage. I'm a fan of this new cast of characters and their exploits/mission!
Charlie
September 3, 2025
This was my first Michael Grumley novel, and certainly one of his higher rated by numerous reviewers. This novel is about a billionaire, David Bruni, whose daughter disappeared while she vacationed in the Caribbean, who hired a private detective, Mike Mansfield, to help him find / recover her. What made this detective story different were the high and low-tech means by which Mike Mansfield and David Bruni used to uncover her whereabouts.
The high-tech methods that David Bruni used were a creative way to incorporate photos and videos that people spread electronically in the past and present. The low-tech methods used by Mike Mansfield utilized a global network of observant seniors to identify and ensnare wrongdoers.
I thought that the dialogue was good, as were the main characters’ means of ferreting out who did what to whom and when.
The high-tech methods that David Bruni used were a creative way to incorporate photos and videos that people spread electronically in the past and present. The low-tech methods used by Mike Mansfield utilized a global network of observant seniors to identify and ensnare wrongdoers.
I thought that the dialogue was good, as were the main characters’ means of ferreting out who did what to whom and when.
November 27, 2025
Fast paced…great story
First I want to say that I received Rollback from Goodreads as a giveaway.
This is the first book I’ve read by Michael Grumley but definitely not the last. It is the first in a series, and I’m looking forward to book 2. It’s exciting to find an author whose books you really like, so I appreciate being introduced to him by Goodreads and his books are on my “read me” list
The story is fast paced and well developed. I don’t believe in writing a summary of the book as my review, you can find that on Amazon or Goodreads.
Strong characters, unusual twists that keep you guessing. I would have liked a bit more character development, but they are interesting and varied … just would have liked a little more. Definitely worth a read
First I want to say that I received Rollback from Goodreads as a giveaway.
This is the first book I’ve read by Michael Grumley but definitely not the last. It is the first in a series, and I’m looking forward to book 2. It’s exciting to find an author whose books you really like, so I appreciate being introduced to him by Goodreads and his books are on my “read me” list
The story is fast paced and well developed. I don’t believe in writing a summary of the book as my review, you can find that on Amazon or Goodreads.
Strong characters, unusual twists that keep you guessing. I would have liked a bit more character development, but they are interesting and varied … just would have liked a little more. Definitely worth a read
August 25, 2025
Michael does it again
It’s not often that an author excites me the way that Michael Grumley does. I’ve devoured every book he has written. He writes with a mix of real world storytelling with just enough “sci-fi” to be plausible. His premises are well researched so that you feel that what he writes could very well happen. Such is the case with Rollback. With AI now more common in the real world, Rollback keeps you turning the pages as you root for the good guys, all while holding your breath that the outcome is as you hope. I can’t wait for Mirage to come out, so that I can see how the next chapter of this journey turns out.
It’s not often that an author excites me the way that Michael Grumley does. I’ve devoured every book he has written. He writes with a mix of real world storytelling with just enough “sci-fi” to be plausible. His premises are well researched so that you feel that what he writes could very well happen. Such is the case with Rollback. With AI now more common in the real world, Rollback keeps you turning the pages as you root for the good guys, all while holding your breath that the outcome is as you hope. I can’t wait for Mirage to come out, so that I can see how the next chapter of this journey turns out.
October 13, 2025
The main character Mansfield, I love him. He’s like your favorite Uncle.
Police work in the future can be helped by AI. What if it’s too slow and it can’t keep up. What if it’s everything we need and we become too dependent upon it. But… what if it’s trying to warn you about what can happen and you’re not paying attention.
This story is a futuristic voyage into police work and a great team of unlikely heroes.
Thank you Goodreads for the opportunity to receive my very own kindle copy of this book.
Police work in the future can be helped by AI. What if it’s too slow and it can’t keep up. What if it’s everything we need and we become too dependent upon it. But… what if it’s trying to warn you about what can happen and you’re not paying attention.
This story is a futuristic voyage into police work and a great team of unlikely heroes.
Thank you Goodreads for the opportunity to receive my very own kindle copy of this book.
February 7, 2026
Interesting
Now I am a bit of a tech 🤓 so when they started talking about what they could so with photos? It was fascinating. But why they were doing what those photos was such a sad thing. Once you know why? You really connect with the characters. And he is right, when he says seniors are not seen like younger generation are. There is a reason for knowing that as well. I just found it a very touching story. Its worth reading and once you get past all stuff about photos, you will really enjoy the story.
Now I am a bit of a tech 🤓 so when they started talking about what they could so with photos? It was fascinating. But why they were doing what those photos was such a sad thing. Once you know why? You really connect with the characters. And he is right, when he says seniors are not seen like younger generation are. There is a reason for knowing that as well. I just found it a very touching story. Its worth reading and once you get past all stuff about photos, you will really enjoy the story.
July 17, 2025
I’ve lost count on the number of books Michael has written. But, I’ve read everyone, being enthralled with his prose, style and the roller coaster rides taken. His latest, ‘Rollback’ definitely soars above the others. Not just because of the subject, but his handling of it. It’ll take your breath away! I can’t say anymore without doing it injustice, so I won’t. Get your copy, read it and be a bird, soaring like the eagle I am!
August 16, 2025
Educational as well as interesting
I love the way Michael Grumley writes. He includes such interesting facts and educational history as well as science. He also uses so much detail in describing people and places that I can really visualize his books. They would make great movies. He does not use pages of descriptions. He intertwines the details in the dialogues and actions so it doesn’t get boring.
I love the way Michael Grumley writes. He includes such interesting facts and educational history as well as science. He also uses so much detail in describing people and places that I can really visualize his books. They would make great movies. He does not use pages of descriptions. He intertwines the details in the dialogues and actions so it doesn’t get boring.
August 21, 2025
A new favorite author!
OMG! This book has it all! Non-stop action, surprise twists, and excellent characters. I very seldom leave book reviews (too eager to start my next book!). I had to review ROLLBACK because its plot was so unique, leaving me wondering who the bad guy (or woman) was and wondering if the main character around whom the story revolves, survives.
Rollback was an absolute pleasure to read.
OMG! This book has it all! Non-stop action, surprise twists, and excellent characters. I very seldom leave book reviews (too eager to start my next book!). I had to review ROLLBACK because its plot was so unique, leaving me wondering who the bad guy (or woman) was and wondering if the main character around whom the story revolves, survives.
Rollback was an absolute pleasure to read.
October 17, 2025
Rollback - a next level investigation
This book is a 'next-level' PI case with an unlikely collection operatives all coordinated at the direction of one Mike Mansfield. In a confrontational firs meeting Mansfield is invited to the home of a wealthy businessman with a proposition he finds he can't refuse.
I read this book in one sitting. I could not find a good place to stop. I highly recommend, 'Rollback' by Michael C. Grumley. - Mr.Bill
This book is a 'next-level' PI case with an unlikely collection operatives all coordinated at the direction of one Mike Mansfield. In a confrontational firs meeting Mansfield is invited to the home of a wealthy businessman with a proposition he finds he can't refuse.
I read this book in one sitting. I could not find a good place to stop. I highly recommend, 'Rollback' by Michael C. Grumley. - Mr.Bill
October 21, 2025
Rollback keeps you enthralled
The book started off somewhat slowly in the first chapter or so but then picked up speed to a great mystery solved. The characters are well depicted, I can see a movie or tv show in my head. Mike Mansfield and his invisible cohorts are super heroes to this old lady. An excellent read, can't wait for the sequel - Mirage - coming in November! Thank you Michael C. Grumley!
The book started off somewhat slowly in the first chapter or so but then picked up speed to a great mystery solved. The characters are well depicted, I can see a movie or tv show in my head. Mike Mansfield and his invisible cohorts are super heroes to this old lady. An excellent read, can't wait for the sequel - Mirage - coming in November! Thank you Michael C. Grumley!
November 23, 2025
Pretty Good Book With Likeable Main Characters
Overall I found this to be pretty entertaining. The main characters were likable. The plot, for The most part kept you engaged.
As for the writing, I enjoy Grumbley's style. It was very easy to read.
I gave it a rating of 4 stars out of 5 simply because there were a few points in the book where I wish the author went into detail about what happened, and instead he left it up to our imaginations. That was my only complaint.
Overall I found this to be pretty entertaining. The main characters were likable. The plot, for The most part kept you engaged.
As for the writing, I enjoy Grumbley's style. It was very easy to read.
I gave it a rating of 4 stars out of 5 simply because there were a few points in the book where I wish the author went into detail about what happened, and instead he left it up to our imaginations. That was my only complaint.
January 1, 2026
Interesting premise
The hero may have some amazing successes but his personality, snarky, taciturn, would normally put off any loyal followers. Yet they are there, standing by, waiting for instructions. To me, that was more unbelievable than the amazing machine which will become another member of his invisible entourage. Rollback may someday be an actuality. It’s not that unlikely.
The hero may have some amazing successes but his personality, snarky, taciturn, would normally put off any loyal followers. Yet they are there, standing by, waiting for instructions. To me, that was more unbelievable than the amazing machine which will become another member of his invisible entourage. Rollback may someday be an actuality. It’s not that unlikely.
August 4, 2025
Kept me up late reading this book. Surprising things happen with the use of a new search tool that uses AI to capture everyone's photographs on line to create a timeline of events. After losing hope for a missing daughter they are able to enhance the timeline of events after 4 years to reach an exiting conclusion. Excellent read, Michael wrote this story that keeps you glued to the book.
August 5, 2025
Riviting
Very original storyline and exceptional characters. I've read slot of Grumley's books but this was different. The use of the variety of characters was unique most of all "THE INVISIBLES". This book kept me engaged the whole way through, not unlike his other books I've enjoyed reading.
Very original storyline and exceptional characters. I've read slot of Grumley's books but this was different. The use of the variety of characters was unique most of all "THE INVISIBLES". This book kept me engaged the whole way through, not unlike his other books I've enjoyed reading.
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