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FBI Agent Gardner Camden is an analytical genius with an affinity for puzzles. He also has a blind spot on the human side of investigations, a blindness that sometimes even includes people in his own life, like his beloved seven-year-old daughter Camila. Gardner and his squad of brilliant yet quirky agents make up the Patterns and Recognition (PAR) unit, the FBI’s hidden edge, brought in for cases that no one else can solve. 


When DNA links a murder victim to a serial killer long presumed dead, the team springs into action. A second victim establishes a pattern, and the murderer begins leaving a trail of clues and riddles especially for Gardner. And while the PAR team is usually relegated to working cold cases from behind a desk, this investigation puts them on the road and into the public eye, following in the footsteps of a killer.
 

Along with Gardner, PAR consists of a mathematician, a weapons expert, a computer analyst, and their leader, a career agent. Each of them must use every skill they have to solve the riddle of the killer’s identity. But with the perpetrator somehow learning more and more about the team at PAR, can they protect themselves and their families… before it’s too late?

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A Good Kill (2021)  

An AMAZON Editor's Pick (June)

In the years since the unsolved deaths of his wife and son, Detective P.T. Marsh of Mason Falls, Georgia, has faced demons professional and personal. But when he is called to the scene of an unfolding crime and secures a clean look at an active shooter, the professional and personal become intertwined…and the consequences are shattering.

 

As Marsh and his partner Remy investigate the shooting, they confront confounding questions—and their search for answers leads them to a conspiracy at the highest levels of local government. The stakes in the case become increasingly high, culminating in a showdown that has Marsh questioning everything he knows…and wondering if some secrets are better left undiscovered.

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The Evil Men Do (2020)

A New York Times Top 10 Crime Novel

What if the one good thing you ever did... doomed you to die?

 

A hard-nosed real estate baron is dead, and detectives P.T. Marsh and Remy Morgan learn there’s a long list of suspects. Mason Falls, Georgia, may be a small town, but Ennis Fultz had filled it with professional rivals, angry neighbors, and a wronged ex-wife. And when Marsh realizes that this potential murder might be the least of his troubles, he begins to see what happens when ordinary people become capable of evil.  

 

As Marsh and Morgan dig into the case, it becomes clear that Fultz's death was not an isolated case of revenge. It may be part of a dark web of crimes connected to an accident that up-ended Marsh’s life a couple years earlier—and that now threatens the life of a young child. Marsh veers dangerously off track as his search for clues becomes personal..and brings him to a place where a man's good deeds turn out to be more dangerous than his worst crimes.

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The Good Detective (2019)

* A New York Times Top 10 Crime Novel

* Finalist: The Edgar Award

* Finalist: ITW Thriller Award

Detective P.T. Marsh was a rising star on the police force of Mason Falls, Georgia--until his wife and young son died in an accident. Since that night, he's lost the ability to see the line between smart moves and disastrous decisions. Such as when he agrees to help out a woman by confronting her abusive boyfriend.

 

When the next morning he gets called to the scene of his newest murder case, he is stunned to arrive at the house of the very man he beat up the night before. He could swear the guy was alive when he left, but can he be sure? What's certain is that his fingerprints are all over the crime scene. 

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Head Cases (2025)  

© 2021 by John McMahon. Author photograph by Nathaniel Chadwick.

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