How many books has John McMahon written?

John McMahon has written 5 books across 2 series. Their published works span from 2019 to 2026.

What is the first book in each John McMahon series?

Here are the first books in John McMahon's series: Detective P. T. Marsh: The Good Detective; Head Cases (PAR Unit): Head Cases.

What order should I read John McMahon's books?

We recommend reading John McMahon's series in publication order. Each series can be read independently.

Is John McMahon still writing new books?

Yes, John McMahon has 1 ongoing series: Head Cases (PAR Unit).

John McMahon Reading Order

2 series · 5 books

Mystery & Thriller

John McMahon is an American mystery and thriller writer who has developed two interconnected crime series featuring detectives navigating complex cases. His Detective P.T. Marsh series, which began with The Good Detective, established his reputation for crafting psychological crime narratives, while his Head Cases PAR Unit series expands his exploration of investigative work through different perspectives. With five books published between 2019 and 2026, McMahon has built a growing body of work that appeals to readers who enjoy procedural mysteries with character depth and moral complexity.

Detective P. T. Marsh Series

Likely Complete

3 books (2019–2021)

Start with The Good Detective and read in order.

Start this series with The Good Detective

Buy Book 1 🇺🇸🎧 Listen free on Audible

#	Title
1	The Good Detective 2019Buy 🇺🇸🎧 Audible
2	The Evil Men Do 2020Buy 🇺🇸🎧 Audible
3	A Good Kill 2021Buy 🇺🇸🎧 Audible

Head Cases (PAR Unit) Series

Ongoing

2 books (2025–2026)

Start with Head Cases and read in order.

Start this series with Head Cases