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John McMahon

Critically-acclaimed author of the P.T. Marsh Series

• Finalist for EDGAR AWARD (Best First Novel)

• Finalist for THRILLER AWARD (Best First Novel)

• NY Times Top 10 Crime Novels of Year

• Amazon Editor's Pick (Best Mystery): A GOOD KILL

Latest Release

A Good Kill 

In the years since the unsolved deaths of his wife and son, Detective P.T. Marsh of Mason Falls, Georgia, has faced demons both 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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William Kent Krueger, Edgar and Anthony- Award-winning author of This Tender Land.

Praise for a

"Cross my heart, this thriller may be the best one you’ll read all year."

"One of the best new crime fiction writers in the business."

Brian Panowich,

Award-winning-author of Bull Mountain

"An utterly propulsive story in which the stakes couldn’t be higher or the outcome more uncertain."

Karen Dionne,
Best-selling author of 
The Marsh King's Daughter


News & Appearances


John McMahon's HEAD CASES, about a team of lovable puzzle-solving oddballs at the FBI known as PAR (Patterns & Recognition) sold to Kelley Ragland at Minotaur in a good deal, by Simon Lipskar at Writer's House.


None currently. Will be announced here with Links.


About John McMahon

John McMahon is the author of A Good Kill, The Evil Men Do, and The Good Detective, which was a finalist for both the Edgar Award and the Thriller Award for best first novel.

His first two novels were each named “Top Ten Crime Novels” of the year by The New York Times Book Review. He lives in Southern California with his family and two rescue animals. 

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