ADAM: A chilling psychological thriller from inside the mind of a serial killer

by J.R. Maren

Ted Bundy was charming. Jeffrey Dahmer kept trophies. Dennis Nilsen never planned the disposal.

They all made mistakes.

Adam Cole does not.

A management consultant by profession, Adam travels from city to city on three-week client engagements — no fixed pattern, no permanent address, a professional record that places him exactly where he's supposed to be.

For seven years, he has studied the failures of the men who came before him. He has corrected every weakness. He has built a system designed to eliminate risk.

Now the system is ready to be tested.

When a missing persons investigation moves into the same district as Adam's engagement, it is not suspicion that threatens him. It is proximity.

ADAM is a psychological thriller told from inside the mind of a man who has made himself untouchable.

The tension isn't whether he slips.

It's whether perfection can survive scrutiny.

The Syllabus — Book One.

96 pages, Kindle Edition

Published March 1, 2026

About the author

J.R. Maren writes psychological thrillers from the killer's perspective.

The Syllabus is a series of standalone novellas — a different killer each time, in the same world.

For review copies and enquiries: jrmaren625@gmail.com

ADAM on Amazon: amazon.com/dp/B0GQQSH5D1

Reviews

[Shelly Meyer]

I thoroughly enjoyed ADAM by J.R. Maren.

This is the kind of psychological thriller that hooks you right away, thanks to its chilling premise. Adam Cole has studied the serial killers who came before him, learned from their mistakes, and built a system designed to eliminate risk. He is careful, methodical, and convinced that he has perfected the process. That makes the story incredibly tense, because the question is not whether he will make obvious mistakes. It is whether someone who sees himself as untouchable can really stay that way.

One of the things I liked most about this book is how plausible Adam’s life feels. His work as a management consultant gives him the perfect excuse to move from city to city, staying just long enough to blend in and always having a professional reason for being there. That detail was so smart and made the story feel even more unsettling.

I also liked that the tension seems to come more from psychology and scrutiny than from constant action. Adam is a character built around control, and that made every possible crack in that control feel meaningful. DS Helen Marsh also sounds like exactly the right kind of detective for this story. The detail that she is the kind of detective who reads a file four times immediately says so much about her. She feels like the perfect threat to someone like Adam.

The reason I’m giving this 4.5 stars instead of 5 is just personal preference: I’m not usually a fan of present-tense novels. That was also the reason I gave People We Meet on Vacation 4.5 stars. Even with that, I still thoroughly enjoyed this book, which says a lot about how strong the premise and suspense are.

Overall, this was a dark, smart, and compelling thriller that kept me engaged from start to finish.

[Kyran]

A great read that combines the behavioural embodiment of a methodical killer with the scrutiny of modern society. With the main sentiment as "don't make the same mistakes", we find a beautiful attention to detail that provides the reader a chance to step into those shoes. I could easily see this concept as a series, an anthology, longer novels. Recommended to any readers who enjoy thrillers, crime, and/or psychological horror.

Reviewer's Note: This review was provided without compensation, other than a free advance reader copy.

[Chapters_with_VDKeck]

Y’all, less than 100 pages and somehow ADAM still crawled under my skin. 😳🔪

This slow-burn psychological thriller is all tension, no fluff. Adam Cole is a traveling management consultant who studied the mistakes of real serial killers and built himself a system designed to make him untouchable. Which is… deeply unsettling. 😬

The real hook is being trapped inside Adam’s head while a missing persons investigation starts creeping a little too close for comfort. JR Maren’s writing is sharp, clinical, and ridiculously effective at building paranoia.

4 ⭐️ Creepy, clever, and disturbingly smart — like LinkedIn for serial killers. 💼🩸

[Ney oh the thrill of it FN]

Interesting read!

My rating is 3.5

Thank you to J R Maren for kindly gifting me a copy of Adam. This review is being left voluntarily and all opinions are my own.

This was definitely a different kind of read for me! Although it was short and fast paced it read quite like a technical manual. I understand the reasoning, though, as we were in the mind of a guy moving through a task in a technical way. Human emotion has been sucked out because that leaves room for errors and this guy has spent time studying others and honed his craft.

There are plenty of references to serial killers.
If you are a true crime enthusiast some references will definitely hit harder. JR has really done their homework and it shows.

There was an undercurrent of tension throughout, but I just needed things to be made a bit more explicit as the technical speak meant I read it going through the motions.

As I began to read it I realised it wasnt quite my normal reads but could appreciate its a good book as reflected in my review I feel its more suited to true crime enthusiasts.

[Annemarie Vicary]

Adam by J.R. Maren is a carefully constructed psychological thriller written almost entirely from inside the mind of a serial killer. The story revolves around what appears to be a murder—or at least what the reader initially assumes is a murder. Interestingly, the act itself is never described in graphic detail. Instead, Adam explains that he will not go beyond what is operationally necessary, constantly reminding the reader that there is a real person at the end of the event.

What makes this novel so intriguing is the immersive access it gives to Adam’s internal world. You are not observing him from the outside; you are inside his thoughts as he meticulously plans, rationalises, and executes his actions. As he moves through everyday life, he works to remain invisible while simultaneously existing in plain sight, and the effect is both unsettling and compelling.

The concept is exceptionally clever and creates a tense, intimate reading experience rooted in psychology rather than spectacle. The horror comes not from explicit violence, but from understanding how Adam thinks and how calmly he moves through the world.

If you’re looking for graphic violence or the gore often associated with thrillers about killers, this book may not be for you. However, if you’re fascinated by the psychology of a serial killer who lives unnoticed among ordinary people, and you enjoy being placed directly inside that mindset, this is a compelling and rewarding read.

[Haider]

💬 Review: This was an interesting read and definitely not the typical type of thriller I go for! Being inside Adam’s head was disturbing, especially seeing everything he did to appear normal while knowing just how different he was underneath. I also liked the parts where he analyzed other serial killers and studied what went wrong for them. That for sure made my skin crawl. The writing itself didn’t have a lot of emotion, but I actually thought that worked really well for Adam and made being inside his head even creepier.

I normally don’t enjoy slow-burn psychological thrillers, and I definitely would’ve liked a little more action. But this was a quick read with a unique premise and no unnecessary filler, so the slower pacing didn’t bother me as much. Overall, I enjoyed it and it definitely made me feel uneasy while reading it!

✔️ Would I recommend it? Yes, but only if you don’t mind a slow-burn psychological thriller that focuses more on the disturbing mindset of the killer than action-packed moments.

[Shiloh (read_w_lo)]

ADAM Review

Rating: 4⭐️

This is a psychological thriller where you’re essentially in the mind of a m*rderer.

Three-quarters of the book is the MC meticulously planning the details to display that he’s an ordinary person who isn’t a m*rderer.

It did get a little repetitive seeing the same routine planned out, but it’s essential to the story.

It’s interesting to see how far one plans out their attack and the fact that the MC constantly review the plan.

The last quarter of the book was interesting just to see if he’d slip up and get caught.

If you like books that contain:
🧠 Psychological thriller
🖊️ Meticulous MC
🧠 Ordinary life
🖊️ Being in the mind of the 🔪
🧠 And more

This book is for you.

(This book was read in exchange for an honest review)

[Prasanthi Gollakota]

This book is not your typical Serial killer thriller. Take all the notable serial killers you have known...now take their MO and how they got caught...all those mistakes and MOs are written as a diary and you'll get to see someone who is MUCH more dangerous.

You'll get to see the inside of a serial killer's mind. Kind of like reading a disturbing diary.

My rating is 4.6/5 ⭐

[Adam Forster-Nnachi]

This was a really fascinating short read. I always think that a shorter book like this needs to be punchy from word one and the author definitely achieved this here with Adam.


I found the narrator's detachment extremely chilling, bordering on threatening. It was almost as if they were challenging the read to question their methods, which was achieved through the excellent writing style.


As a true crime fan I really enjoyed how Adam analysed the work of other prominent serial killers, especially his highlighting of their flaws and the mistakes that led to their respective downfalls.


Some readers may find the language overly technical, but I feel it was only used to accurately represent the level of detail in the killer's method.


Definitely looking forward to reading more from the Syllabus series and from JR Maren.

[Heather Barksdale]

“ADAM: The Syllabus: Book 1” introduces Adam Cole, a consultant assigned a three-week position as part of a client-management team. The job’s going well, Adam’s contributing and settling into a routine.

Overall, I found this to be a unique take on the serial killer genre. Written in the first-person, this novella feels more like diary entries than a typical serial killer thriller. Adam Cole is methodical, structured, and detail-oriented. He’s also aware of an internal need to kill. Find the full blog post review at heatherlbarksdale.com

I received a copy of this story in exchange of a fair and honest review.

[twistedchapter13 | Stacy]

This book completely pulled me in! From the beginning, I was intrigued by the story and couldn’t stop wondering where it was going to take me.
The pacing kept me turning the pages, and there were plenty of moments that had me questioning what was really happening. I loved the suspense and the way the story slowly unfolded without giving everything away too quickly.
There were a few things that didn’t completely work for me, but overall, this was a gripping and unsettling read that kept me invested until the end.
If you enjoy psychological thrillers with plenty of suspense and a story that keeps you guessing, definitely add Adam to your TBR!

[Mason Harrison]

What caught my attention about ADAM was the decision to tell the story from inside the mind of the killer rather than making the investigation the only focus. Adam’s obsession with studying the mistakes of other killers creates a disturbing premise, especially because he seems to have built his entire life around avoiding exactly those mistakes.

I liked the tension created by the idea that Adam believes he has designed a nearly perfect system, while the missing persons investigation is gradually getting close enough to threaten it. There’s something particularly unsettling about watching a character who is confident that he has thought of everything and wondering what could finally expose him.

The management consultant angle also works well with the premise. Constant travel, temporary locations, and professional reasons for being in different cities give Adam an interesting cover and make the story feel different from a typical serial-killer thriller.

At only 96 pages, this is a fairly quick read, which I think works well for a tightly focused psychological thriller. The story seems more interested in suspense and psychological tension than simply piling on graphic violence, and that was appealing to me.

If you enjoy dark psychological thrillers, serial-killer stories, unreliable minds, and suspense built around the question of whether a seemingly perfect plan can actually survive scrutiny, this one is worth checking out.

Definitely creepy in the best way, and the premise leaves you wondering just how long Adam can stay ahead of everyone else.

[Bhoomi]

4.7/5 stars
This was a very unique and enjoyable read for me. I really loved the setting and, more importantly, the concept.
The story follows Adam, a management consultant on the surface, but a serial killer at his core. What makes him fascinating is how calculated he is. He has studied other serial killers, learned from them, and refined his own “acts” (as he calls them) to perfection. Adam doesn’t make mistakes — not in his profession, and not in his killings. In fact, his job becomes an advantage, giving him the perfect excuse to travel across cities and operate unnoticed.
At its heart, this book is a deep dive into the mind of a serial killer. It doesn’t try to justify or condemn. It simply presents. And strangely, that’s what makes it so compelling. It feels like you’re given access to a mind you’re never supposed to understand… and yet, you can’t look away.
It’s like observing everything from inside his head, every thought, every action, every “act.”

Personally, I did find the writing a bit hard to get into at the beginning, which is why it’s a 4.7 instead of a full 5. But once I settled into it, the writing became one of the strongest parts of the book and made the experience even more immersive.

[Rachel | probablymidchapter]

ADAM by J.R. Maren was such a quick but unsettling read. This book drops readers directly into the mind of a serial killer who has spent years studying the mistakes of real-life killers and creating a system designed to make himself untouchable.

What made this one stand out to me was how methodical everything felt. The chapters carefully walk readers through Adam’s thought process, planning, routines, and decision-making in a way that felt disturbingly realistic. There were no rushed moments or chaotic scenes just for shock value. Instead, the tension came from watching how calculated and controlled he was while convincing himself he could never get caught.

Being inside the killer’s head the entire time made this such an interesting reading experience. It created this slow, creeping tension throughout the story because you knew how dangerous he was while everyone around him remained unaware.

The clinical tone and detached narration made the story even more chilling. If you enjoy dark psychological thrillers that focus more on the killer’s mindset and meticulous planning rather than graphic action, this is definitely worth checking out.

[Jamilah Green | Apothecary Tales Press]

ADAM is a tightly written psychological thriller that knows exactly what it’s doing. Maren builds tension slowly and deliberately, letting the detective piece together patterns from a distance rather than through direct confrontation. It’s a cerebral, methodical unraveling that fans of psychological cat‑and‑mouse stories will appreciate.

This wasn’t quite the right fit for me, but that’s entirely due to my own reading tastes. I’m a historical fiction and history reader, and psychological thrillers—especially those in the vein of The Silent Patient or The Girl with the Dragon Tattoo—have never been my lane. Even so, I can recognize the craft at work here.

Readers who enjoy dark, character‑driven, slow‑burn thrillers will find a lot to admire in ADAM. While it wasn’t my genre, it’s undeniably well executed and will resonate with the right audience.