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John McMahon is an American author of mystery, suspense and thriller novels.

He is best known for writing the critically acclaimed Detective P.T. Marsh Series.

John acquired his education at the University of Arizona, where he studied Creative Writing.

He then went on to work as an ad agency creative director, where his creation received a Gold Clio for Fiat.

John has also written a Superbowl spot for Alfa Romeo.

His novels The Good Detective (2019) and The Evil Men Do (2020) were each named "Top 10 Crime Novels" of the year by The New York Times Book Review, with the former also becoming a finalist for both the Edgar Award and the Thriller Award for best first novel.

John currently makes his home in Southern California, where he lives with his family and two rescue animals.

More about John McMahon

Genres: Mystery, Suspense, Thriller

United States


Detective P.T. Marsh

  1. The Good Detective (2019)
  2. The Evil Men Do (2020)
  3. A Good Kill (2021)

Detailed book overview

Detective P.T. Marsh

The Good Detective

How can you solve a crime if you've killed the prime suspect?

Since the night his wife and son were killed in an accident, Detective P.T. Marsh can't see the line between bold moves and disastrous decisions. But when the former rising star of the Mason Falls, Georgia, police force decides to help out a woman by giving her abusive boyfriend a taste of his own medicine, he might have crossed a line. 

The next morning he gets called to the scene of his newest murder case, and is stunned to arrive at the house of a dead man, the very man he beat up the night before. As P.T. and his partner, Remy, begin to suspect the murder is connected to a local arson and the lynching of a teenage boy, P.T. realizes he might have killed the top suspect of this horrific crime.

Amid rising racial tension and media scrutiny, P.T. uncovers something even deeper beneath the boy's murder--a conspiracy leading all the way back to the time of the Civil War. Risking everything to unravel the puzzle even as he fights off his own demons, P.T. races headlong toward an incendiary and life-altering showdown.

Author: John McMahon
First Release: 2019
ISBN: 978-0525535546
Publisher: G.P. Putnam's Sons
The Evil Men Do

What if the one good thing you did in your life 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.

Author: John McMahon
First Release: 2020
ISBN: 978-0525535577
Publisher: G.P. Putnam's Sons
A Good Kill

A troubled small-town police detective is faced with three interwoven crimes that reveal sinister secrets about his community--and the deaths of his family.

In the years since the mysterious deaths of his wife and child, P.T. Marsh, a police detective in the small Georgia town of Mason Falls, has faced demons--both professional and personal. But when he is called to the scene of a school shooting, the professional and personal become intertwined, and he suspects that whoever is behind the crime may be connected to his own family tragedy.

As Marsh and his partner Remy investigate the shooting, they discover that it is far from straightforward, and their search for answers leads them to a conspiracy at the highest levels of local government--including within the police force. 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.

Author: John McMahon
First Release: 2021
Ebook: B08K7LTJ3F
Publisher: G.P. Putnam's Sons