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Dangerous Behavior

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After fifteen years in solitary confinement, Victor Thomas Janko—the notorious Baby Carriage Killer—has become eligible for parole. And it is up to Dr. David Rothberg, the new prison psychiatrist, to determine whether Janko should be released.

As David finds himself drawn into the psychological quicksand of a disturbed inmate, his manipulative girlfriend, and a brutal guard, David needs to confront his own demons as he decides if Janko deserves a second chance. This high-voltage thriller will keep you at the edge of your seat and guessing until the very last page.

296 pages, Kindle Edition

First published October 15, 2002

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Walter Marks

22 books42 followers

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5 stars
318 (34%)
4 stars
313 (34%)
3 stars
197 (21%)
2 stars
62 (6%)
1 star
25 (2%)
Displaying 1 - 30 of 74 reviews
Profile Image for Evelyn.
1,762 reviews
April 24, 2008
A young prison psychiatrist must decide if Victor Janko, the notorious Baby Carriage Killer, should be eligible for parole after spending 15 years in solitary confinement.


A suspenseful and compelling read. Film rights sold. Just when you think you know what's going on, the story shifts 180 degrees. Highly recommend.
Profile Image for Jeanine.
1,075 reviews9 followers
August 28, 2017
This was a disjointed read for me. It was going along so well then the author just kinda finished it, WHAT? That's not what happened...surely. So I really enjoyed the characters up until it was just stupid.
Profile Image for Thomas Zman.
Author 16 books57 followers
November 16, 2017
Great book. I could feel the danger. Sick and twisted in parts. I was impressed how he had taken an old book and updated it to more current times. I had an empathy for the characters. I am looking to read some of his other works.
Profile Image for Jan.
1,885 reviews97 followers
January 28, 2022
The hazardous, psychological quicksand of a seriously disturbed prison inmate has prison psychiatrist. David Rothberg, losing his perspective when he believes the inmate was falsely imprisoned. To which character does the "dangerous behavior" belong? This is a fast moving story and while some believe the inmate of being the devil incarnate, others led credibility to the belief of his innocence.
Profile Image for Tulay.
1,202 reviews2 followers
December 15, 2014
Is he guilty, no he's not...

You'll be asking yourself these questions over and over. Interesting subject, prisons and physiology. Well developed characters, even a ninja. Short, good book.
Profile Image for Beth.
723 reviews
December 31, 2014
A suspense story told by the doctor while he solves the murder that the patient/convict was put in prison for.

Great premise but not a great story.
Profile Image for Michael Slavin.
Author 8 books283 followers
February 8, 2024
Very interesting in the beginning!
After fifteen years in prison, the Baby Carriage Killer gets a new shink, Dr. David Rothberg.

I liked this story for maybe 60%, then it moved out of prison, then back in, and it picked up my interest again...then the ending happened. I wouldn't say I liked the ending.

What I liked:
-All the scenes in the prison.
-The interaction of Dr. Rothberg and Janko, the prisoner, and the other characters.
-This was a unique and exciting book until the trip to NY. It still held my interest.

What I didn't like:
-Dr. Rothberg's obsession with big breasts in his inner thoughts.
-The ending. Up in the air.

I wasn't sure why:
-The little turtle Dr. Rotherberg took care of for a sick child. It didn't seem to add to the story for me. But it was a cute addition.
-His associate, an older lady, was carrying a Desert Eagle...a monster of a weapon for an older lady to carry around as a concealed weapon.

Would I recommend this book? Yes, but if you hate a cliff hanger ending, maybe not.
Profile Image for Nancy Burkey.
Author 1 book29 followers
August 10, 2017
Dangerous Behavior has a fun plot that keeps you guessing to the end. The main character has an interesting perspective and helps you become fully immersed in his world. His world of psychiatry and NY prisons was presented in an interesting way. For me, there was some annoying distractions, like the mc/author's seeming obsession with women's breasts which seemed to be the only part of the women that was interesting to the men, and that perspective got a bit tedious. It also seemed a bit sophomoric and unfortunately cheapens what would otherwise be very good writing. If one can overlook that, the plot keeps you engaged and the pages keep turning as you are driven to discover 'who done it?'.
Profile Image for Ski Croghan.
609 reviews5 followers
January 12, 2022
This is a good book, but......

This was a good book but was slow in spots. That said, I will read the next one and others by this author. It was gritty realism. The prison scene were very believable. The fight scene at the sex club was not very believable. And the ending was not what I expected. But the biggest problem was not finding out if the prisoner was really guilty or not. I tend to think not. The ending did give me satisfaction. It was fitting. Not for under 18 years old readers, but that's my opinion. Recommend for readers who don't mind a little rough talk and blood and guts or sexual references.
Profile Image for Vivian.
798 reviews10 followers
August 19, 2017
"...every psychiatrist is a detective because every patient is a mystery." Dr. Rothberg was hired by the county corrections to work with inmates and determine whether or not they're eligible for parole. Victor Junko was one of them. Accused of brutally murdering a woman in her own apartment, in front of her toddler, and walking away only to be picked up by the police with the weapon in hand. Was he guilty or psychotic or both?

~ as the protagonist was drawn in, so was I. The clever banter between characters kept the story light and enjoyable.
Profile Image for Karl Wiggins.
Author 25 books324 followers
September 27, 2017
Didn't do it for me, I'm afraid. I've read a number of books about lunatics in psychiatric wards and prisons and the action's always fast-paced and vicious. This book ambles along at it's own little pace telling us about the doctor's migraines and his motel room and I kept thinking, "Get on with the story! Where's all the action?"

I read 29% and I'm aware there are those who say you shouldn't review without reading the whole book, but how much of a bad steak do you need to eat before realising you're not enjoying it?
38 reviews
February 3, 2018
MURDER MYSTERY - MAYBE

"DANGEROUS BEHAVIOR" is a psychological mystery + the 1st book I've read by Walter Marks.
Victor Thomas Janko known as the Baby Carriage Killer, has been in solitary confinement in a NY prison for 15 yrs + is up for parole.
Dr David Rothman is his new prison psychiatrist + its up to him if Janko gets out.
This story has it all, from the insane criminal, Daisy, his girlfriend, Karp, the prison guard, other interesting characters + Ninja, the turtle ...
It's a quick read, that will keep you guessing, is he guilty ?

Profile Image for Joyce.
1,801 reviews18 followers
May 19, 2021
A psychological thriller

A man is imprisoned for life for the brutal stabbing murder of a woman in front of her 2 1/2 year old daughter. A new psychiatrist has just started working there and begins to believe the man did not commit the murder. He begins to investigate and to establish a connection with the prisoner. Going further into it would lead to too many spoilers, however it is well plotted and well written with a colorful cast of characters. The ending is not predictable. Thanks to the author and publisher for an e-galley for an honest review.
Profile Image for Evelyn C.
23 reviews2 followers
May 21, 2022
What I liked most about Dangerous Behavior by Walter Marks is that he actually managed to surprise me with not one but two things I didn't see coming. It would spoil the book if I commented on what those surprises were but it's rare these days for me to read a mystery to not see where the author is going with the story. I do however agree with one reviewer who mentioned the ending was quite abrupt. It left me wanting to know what happened to the main characters after the events in the last chapter.
Profile Image for Elizabeth Sanguedolce.
Author 5 books11 followers
May 12, 2025
You Won't Know What Hit You

This is my first Walter Marks book, and I will be reading another one right away! Amazing range of emotion, full of extremely descriptive words you don't ever hear (I love learning new words!). The story is multifaceted which adds to the dimension and intrigue. Although I am unfamiliar with the various New York locations, it was easy to follow Marks' descriptions and imagine the story. The ending was a sucker-punch, never to be forgotten. I didn't know what hit me and you won't either. Bravo! Fantastic job!
Profile Image for Marla Madison.
Author 12 books112 followers
July 2, 2017
I thought the plot was an interesting one, but the main character was so far removed from how a real therapist would behave, it was just ludicrous. He talked about his client with the guy's girlfriend, and then nearly had sex with her! This story could have been good, but was so far from reality that it just lost its ability to captivate an intelligent reader. The turtle was the most believable part.
Profile Image for David Brown.
239 reviews4 followers
July 23, 2017
I found this book highly entertaining and educational as well. It is set in a prison. A new shrink is going to save the criminally insane. He is given one prisoner to focus on. This criminal has committed a heinous crime but manifests as a gentle soul. The shrink explores his history. The book winds up with an unexpected end. Why educational? There are lots of medical terms and drugs mentioned in the book. Following them up on Wikipedia has enlightened me.
52 reviews2 followers
February 19, 2019
Twist to die for

I really enjoyed this book, really gave my imagination a good run.
To be honest I'm still doubting Janko's plea of not murdering anyone. But for someone who was brought up like Janko, it kind of makes sense for him to be guilty.
I really didn't expect the ending but in a way so glad Karp got his comeuppance.
So glad I read it, will be one I definitely recommend.
Profile Image for Amanda Parsons.
108 reviews
December 7, 2017
I wanted to like this book. However, I’m not sure what kind of prison this is. Correctional Officers aren’t armed. Prison psychiatrists don’t run around and solve mysteries and almost sleep with an inmate’s girlfriend. They don’t chase down who they think did it and try to get their DNA.

Ugh.
This entire review has been hidden because of spoilers.
30 reviews1 follower
September 5, 2018
Happy Endings

I confess - I love happy endings. No matter what trials and tribulations the characters go through, I want it all to work out well in the end.
Does this book qualify? You'll have to read it to see - it's guaranteed that you'll find several surprises along the way.
I finished this book in one afternoon - found it very engrossing and enjoyable
667 reviews26 followers
September 18, 2019
I really enjoyed this book. It was full of psychological intrigue. I loved the plot and how it had so many twists and turns in it. I was always on edge wondering what could happen next. I love how the author writes which keeps your emotions high. I love the characters. I want to read more from this author!
Profile Image for Sandra Burns.
1,800 reviews41 followers
January 8, 2022
Wow!

Doctor decides to apply for a position at a prison.He gets it. One of his patients, is a man accused of killing a woman, with a child. The doctor, thinks he is innocent, and does various things to help prove that. There is also a Priest, and a sadistic prison guard, who mess with Victor (the supposed killer).The ending was so good!
116 reviews
July 31, 2022
Loved Dr. Rothberg

This was an exciting interesting story. I listen to books as I do chores and found myself engrossed in the story. I really appreciated that Dr. Rothberg was well aware of his own problems but was still able to help others. Great ending really looking forward to book 2.
Profile Image for Tara.
Author 2 books57 followers
October 30, 2023
Edge of your seat read

This book was exactly what I needed. It pulled me in and kept me interested the whole way through. When the twist happened, my mouth fell open. I was completely shocked. The ending had me just as shocked. The only issue I had with the book is the grammer, and it could use some proof reading again.
Profile Image for mohan raj cpm.
20 reviews
June 30, 2017
Dangerous Behavior.

The author plays with your emotions,strings you along and finally the unexpected ending leaves you begging for more! Guaranteed to help you run the gamut of emotions from fear,love,hope and despair.
679 reviews29 followers
March 24, 2018
This was an interesting book. A criminal is up for parole. He was found guilty of murder. A new Dr. at the hospital believes he may be innocent of the crime. There are several twists and some humor on this journey. Can Dr David find the evidence he needs?
Profile Image for Angel Graham.
Author 1 book33 followers
April 5, 2018
Okay. But the ending. Just don't buy it. Actually ruined a mostly decent book. I did't find the main character all that enjoyable. Sounded like he needed a shrink himself. Along with most everyone else in the book.

Profile Image for Jacki Prettyman.
251 reviews
September 24, 2019
Suspenseful and I liked the main characters. If the author has focused less on the good doctor's lustful thoughts it would have read even better. I enjoy psychological thrillers and this one truly had some twists that kept me guessing.
3 reviews
October 26, 2019
.

It is a bit difficult to start reading. Basic story very good. End of story very unsuspected and dark. I really loved the end. I also liked that the people are real and not perfect
Profile Image for Angela.
115 reviews2 followers
June 6, 2020
Great story!!

Kept me on edge of my seat, surprised me several times! My only complaint was at times it got a bit wordy and dragged some making me want to skim through pages/paragraphs. But overall a great read!
Displaying 1 - 30 of 74 reviews

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