Killer Knows Best

by Addison Moore

In a world where every shadow hides a predator, trust is the most dangerous game.In the glitzy world of high society and the dark streets of the wrong side of the tracks, a predator lurks—striking fear into the hearts of women from all walks of life.

FBI Special Agents Fallon Baxter and Jack Stone are back, facing their most chilling case yet. A ruthless serial killer is targeting women in Denver, from glamorous socialites and college sorority girls to vulnerable prostitutes. The killer is ruthless, leaving a trail of terror in their wake.

Clean language and heart-stopping twists that keep you glued to the edge of your seat until the very last page.



A brand new FBI Mystery Series by New York Times , USA TODAY, and Wall Street Journal bestseller Addison Moore.

Addison’s work has been featured in Cosmopolitan Magazine.

When the bodies of two young women are discovered in a ritzy hotel room, Fallon and Jack are plunged into a network of corruption and deadly secrets. The investigation takes them from the luxurious ballrooms of the city’s elite to the dark alleyways where desperation and danger intersect.

As the body count rises, Fallon and Jack find themselves racing against time to stop the killer before they claim another victim. The stakes become personal when Fallon discovers a chilling connection to her own past, leading her down a path she never expected. And in a shocking twist, Jack’s past comes back to haunt him and brings all of his demons along for the ride.

Killer Knows Best is a heart-pounding thriller that explores the dark corners of society, where ambition, lust, and power collide with lethal consequences. With a relentless pace and a twisting plot that keeps you guessing until the very end, this is a must-read for fans of suspense and crime fiction.

220 pages, Kindle Edition

Published March 6, 2025

About the author

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Addison Moore is a New York Times, USA Today, and Wall Street Journal bestselling author of cozy mysteries and romance. Her new book MIDLIFE IN GLIMMERSPELL is NOW available! Read today!
Cosmopolitan Magazine calls Addison's books, "...easy, frothy fun!"
Humor with a side of homicide.


FREE with Kindle Unlimited! Amazon-->https://amzn.to/3AnyVhs Hibiscus Homicide Cruise is here! An impending divorce. An ornery homicide detective. The cruise of a lifetime. And ghosts. Midlife on the high seas is proving to be a real killer.
#Cozymystery #Kindleunlimited #mystery #PWF

Reviews

[Deb · Rating 4 out of 5]

Exciting thriller

Addison Moore wrote this extremely well. Good backdrop on the characters.
About 80% in I knew the serial! Killer had to be one person or their friend. A very exciting ride. There's a iittle romance thrown in, and family issues that are finally resolved.also. This series ended well. I encourage readers to read the first one and continue to the end.

[Emmalynn · Rating 4 out of 5]

Book 4 and it was a good one. Family drama! A killer trying to cleanse a certain population and a sister found. The investigation and action was pretty steady. I guessed the killer after they were mentioned a couple times and their twisted reasoning.

[Mindy · Rating 4 out of 5]

I loved this story. It had just the right amount of thrill, suspense, and mystery, with a bit of romance and animal fun mixed in, to make it the perfect creation. Well done to the author! I'm looking forward to seeing what comes next.

[Mandy · Rating 5 out of 5]

I have been hooked on Fallon Baxter and Jack Stone since the first book and couldn’t wait to see where their jobs with the FBI took them next. Women were being murdered and the only distinguishing mark tying them together was an infinity sign on each of their bodies. The women were high end escorts, hookers, and college students looking to make some money. I felt so horrible for the first victim we learned about in the story. This was her first time doing something like this and she was having doubts, yet ended up being murdered anyways. She had her whole life ahead of her. I had it narrowed down to two people being the murderer, and I was leaning harder towards the one because I couldn’t figure out the motive for the other. I was wrong in my first thought and it all started to make sense when the clues started lining up more and more.

We also have a surprise person show up in the story….well actually two… the first being Jack’s mom. It was the perfect time for her to show up because she’s an addict and a hooker and even prison didn’t change her ways. The second surprise person to pop up in the book, I can’t give that away. You have to read the story for yourself! You won’t be disappointed. It’s a fast paced who dun it and you just fall in love in with the relationship blossoming between Fallon and Jack, laugh at Nikki’s outrageous ways, and want to cuddle up with Buddy the dog and Misty the cat.

I can’t wait for the next book to come out! I love all of Addison Moore’s books especially her cozy mysteries, but I enjoy the fact this one is a little darker than the lighted hearted cozies I have come to crave reading. It’s a little more serious than the other series and once in a while I like to change it up, so this series is perfect!.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.

[Rebel · Rating 5 out of 5]

Addison Moore does it again with Killer Knows Best, pulling me into Fallon Baxter’s world of relentless pursuit, dark secrets, and the kind of tension that had my heart pounding from start to finish. If you love a thriller that makes you second-guess every shadow and keeps you up way past bedtime, this one delivers in spades.

From the moment Fallon and Jack step into that crime scene—a ritzy hotel turned hunting ground—you can feel the weight of something bigger, something more sinister. This isn’t just about catching a killer. It’s about peeling back the layers of a society that thrives on power, corruption, and well-buried secrets. And as the body count rises, so does the personal cost.

What I love most about Fallon is that she’s not just a sharp investigator—she’s human. She’s fierce and determined, but there’s a vulnerability beneath that tough exterior, especially when this case forces her to confront her own past. I felt every twist like a punch to the gut, especially as Jack’s own demons clawed their way back into the present. The tension between them, both personal and professional, adds another layer to an already explosive plot.

Moore has a way of crafting mysteries that don’t just keep you guessing—they consume you. Every time I thought I had the killer pegged, another clue sent me spiraling in a different direction. And that final twist? Chilling. It’s the kind of reveal that lingers, making you rethink every single breadcrumb Moore so masterfully laid out.

This isn’t just a thriller. It’s a deep dive into the darkness people try to hide, the power plays that turn deadly, and the haunting grip of the past. If you’re a fan of heart-racing suspense with characters who feel real enough to bleed, Killer Knows Best needs to be on your TBR. Just be warned—you won’t put it down until the very last page.

[Ella · Rating 5 out of 5]

does the killer know best?

Killer Knows Best is the forth book of Fallon Baxter FBI Mystery Series. This series pulls you in and to the problem solving from the beginning. The main focus is on Fallon Baxter and her partners Jack Stone and Nikki. The cases they get and some of their personal lives.
Killer Knows Best starts with the evil that thinks they are doing the good works of the world by ridding it of the fifth that walks the streets. As the bodies keep accumulating and the leads are not pointing them to a killer they are trying to use what they can to narrow down who might have done it.

[Becca · Rating 5 out of 5]

I swear we all kind of need a spirit animal that's a mix of Falling and Nikki. Gah they had me laughing. And Buddy....who wouldn't love that baby. The characters in this book and series are so great. My heart just goes out to Jack because I know he wants to make a difference and wants to help his family but...maybe sometimes you gotta let them go?? I love that these characters have been through it. Not that I want anyone to suffer but they're real. Or realistic. Life is not all sunshine and roses BUT it makes for great reading! I can't wait to see Buddy again!.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.

[Margery · Rating 5 out of 5]

Addison Moore has woven her magical talents once again. In the page turning story of a serial killer, the clues are scant. One thing that ties them together is a symbol of life on each girl and their night time profession, new or experienced. The relationships between returning characters is great, offering that romantic sigh as well as the proverbial giggle. There is not a lack of twists and turns and IF you feel brave enough to try to figure out who is doing this, um, we are talking about Addison Moore... good luck!

[Kristen Lewendon · Rating 5 out of 5]

I kind of don’t know what to say about this book that isn’t going to give away all the answers. I was hooked practically from the moment the story opened, and I hung on every word until the very end. I needed to know how accurate my pet theory was about who would turn out to be the villain. There was also some bonus family drama in Fallon and Jack’s lives that kind of left my jaw hanging open and my brain spinning. After that wild ride, I can’t wait to see what the author has for us next.
I received a complimentary advance copy of this book through Booksprout.

[Kandiemarie · Rating 5 out of 5]

This intense page turner is intriguing and captivating. I was hooked from the start and couldn't stop reading until I finished it. The suspense had me on the edge of my seat. Figuring out who the serial killer was had me instantly intrigued. I figured it out before the story was over but was totally worth reading till the end. It's a very good way to keep entertained. Highly recommend reading and I look forward to reading more from Addison Moore.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.

[Eve Jones · Rating 5 out of 5]

I'm loving this series 😍
I really like the FBI books that Addison writes. This is the second series, and it is just as good as the first.
I really like the fact that you get different characters points of view throughout the book, it makes it really interesting knowing what they are thinking.
I also enjoyed the Fallon and Jack will they won't they romance.
There are a few surprises in this book as well that are sure to shock you.
I'd definitely recommend this series if you enjoy a good thriller 🤓📚.

[Sandy T · Rating 4 out of 5]

I enjoyed this mystery, it kept me engaged throughout. I did guess the correct culprit early on but not their exact motive. I thought the pace was good, the right balance between the main characters' relationships and the quest to solve the murders. I was satisfied with the ending and will continue the series.

I received a free advance copy from the author via Booksprout and am voluntarily leaving an honest review.

[Robbiega · Rating 5 out of 5]

Addison Moore does some excellent writing you have the killer expressing their thoughts under the heading of evil while we along with the FBI agents try to figure out who the killer is. This was a good addition to the series. The agents are not bigger than life but very real people with very real issues and family problems. I am looking forward to the next book!.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.

[J Young · Rating 5 out of 5]

Vendetta or vengeance?

A killer is stalking the streets and women are dying. Special Agents Fallon Baxter, Jack Stone, and Nikki Knight scramble to unravel the meaning of the mark left on each victim before the killer strikes again.

This is a mesmerizing page-turner. Not afraid to walk at night? You might be after reading this! I received a free copy but my review is honest and voluntary.

[Stacie Bucholtz · Rating 5 out of 5]

No matter what genre Addison Moore writes, she draws you in from the beginning. Agents Baxter, Stone, and “Buddy”, along with other members of the FBI are on the hunt for a killer who’s on a murder spree. To catch the one responsible, Fallon and Jack have to each deal with parts of their past. Follow the twists and turns that this riveting tale will take you on to find a killer before they can kill again.

[Michele A. · Rating 4 out of 5]

Fallon and Jack find themselves on the hunt for a serial killer. Escorts are being bumped off at an alarming rate and they are trying to figure out who is behind it. It was an interesting tale. There was a lot of drama and it never seemed to end at points. I liked how Jack was trying to do the right thing by his family too. I don't want to give away what happens, but I will say that it was not tame at points.

[Big Fat Hairy Man · Rating 4 out of 5]

Special agents Baxter and Stone are on the trail of a serial killer who is hunting women of all classes across Denver. They need to track down and stop this merciless killer before the body count escalates, even with their pasts raising their ugly heads. This is an interesting, FBI-based, mystery thriller with plenty of suspense and plot twists to keep the reader engaged.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.

[Michelle · Rating 5 out of 5]

Special Agents Baxter and Stone are back in Killer Knows Best, book four of the Fallon Baxter FBI Mystery Series. In this book, the agents are hot on the trail of a serial killer who is killing women, from prostitutes to socialites. This well-written murder mystery is full of intrigue, suspense, and unexpected twists, making it a page-turner. I look forward to reading the next book in the series. I voluntarily reviewed a copy of this book.

[Terri · Rating 5 out of 5]

Fallon Baxter and Jack Stone ate FBI Special Agents dealing with some of the most terrifying of cases. Their newest case is that of a serial killer targeting women in the Denver area. With the body count rising, can they find the killer before more women die? With plenty of twists and turns, anyone who loves thrillers will be on the edge of their seats! Can you figure out who the killer is or will you still be guessing until the very end?

[Lizz Taylor · Rating 5 out of 5]

Fallon and Jack are on the case of a serial killer who has ladies of ill repute on their hit list. As the FBI tries to uncover the killer, Fallon is also trying to find her sister who has gone underground. Buddy is his helpful canine self. This is a page turning cozy thriller that can be read as a standalone.

[Reader · Rating 5 out of 5]

This was very suspenseful and very much a page turner. It’s one of those books that should be read in the light of day with the doors locked. I loved the different POVs. I highly recommend this for fans of thrillers. I’ll be reading Addison Moore again.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.

[Julie · Rating 5 out of 5]

Serial killer

Fallon and her team are off again with another murderer to track down. This one is killing prostitutes and leaving their mark on the bodies. Now it's a race to try and figure out who the killer is without more bodies turning up. I enjoy the characters, the storylines, and trying to figure out who the killer is. I hope to see more if the FBI team in future books.

[LizJ. · Rating 5 out of 5]

Killer Knows Best Book 4 of Fallon Baxter FBI Mystery Series by Addison Moore is an thrilling page-turner!! I was glued to this book from the first page! This is Addison Moore at her finest!! Bring on the next book!!.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.

[Jacqueline Johnston Cotton · Rating 5 out of 5]

This book was so good! Suspense, intrigue and a serial killer on the loose. The plot is well laid out to bring together a well paced, interesting, amazing mystery. Twists and turns galore that kept me glued to the pages. These characters are so real and believable. You'll easily fall in love with them, some again and the endearing romance of it all. This book was seriously hard to put down.

[Judy · Rating 4 out of 5]

alts Going On

This was a good book. I liked the characters and the budding romance between partners. I gave it four stars as it didn’t have the kinds of twists and turns that grab my attention and won’t let me go. However it had a great opening and ending that makes it worth investing your time in reading it.

[Mary Rowe · Rating 3 out of 5]

disquieting targeted serial killings

Two cash-strapped college students, one a complete newbie, attempt to supplement their income by the world’s oldest profession - only to be discovered, dressed to the nines, their throats slit and their bodies decorated with the infinity symbol.

[Phthon · Rating 5 out of 5]

Crazy case! I didn’t figure it out until the killer was revealed. I enjoyed that neither Fallon nor Jack are perfect but have worked hard to be where they are today. I enjoyed this book and look forward to reading more!

[Molly · Rating 5 out of 5]

tangled connections between chosen and biological family, friends, heartbreaks, and sweet chick bait pups make for intense and very twisted reading.

emotional psychological thriller and drama - and don't forget the folks out to kill them, and the floofy dog!

[Rebecca Brown · Rating 5 out of 5]

A wonderful thriller by author Addison Moore.
Really awesome character, lots of mystery and intrique.
Loved reading this awesome book... Highly recommend...

I received a free copy of this book via Booksprout and am voluntarily leaving a review.

[Ann · Rating 5 out of 5]

This book hooks you on the first page and doesn't let go. it's about a serial killer that thinks he's doing good.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.