5 books in series

Spycatcher

Spycatcher is a 7-book series with 5 released primary works first released in 2011 with contributions by Mathew Dunn and Matthew Dunn.

Spycatcher
Sentinel a spycatcher novel
Counterspy: A Spycatcher Novella
Dark Spies
Spy Trade
A Soldier's Revenge
Act of Betrayal