There are 2 books in the Double-A Western Detective Agency series. The newest book is No Hallowed Ground which came out in 2024.

1
Hired Guns

Book cover of Hired Guns
Embark on a Wild West odyssey where gold-seeking turns into a blood-soaked pursuit in 1894.

When former Army officer Oswin Diehl ventures into Mexico in search of fortune, he encounters more than he bargained for—bandits and chaos. Saved by old comrades Ira Hoop and Apache scout Eskaminzim, Diehl is offered…
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2
No Hallowed Ground

Book cover of No Hallowed Ground: A Western Novel
In a relentless chase across Missouri, four brave souls confront a hidden cabal of Confederate conspirators in a battle for the nation's future.

When the A.A. Western Detective Agency needs to hunt men down, it turns to its toughest operatives: former cavalrymen Oswin Diehl and Ira Hoop and their Mescalero…