Start with high-confidence espionage books, then narrow by subgenre or adjacent topics.
Catch and Kill
Ronan Farrow, Little, Brown & Company
Bottoms Up and the Devil Laughs
Kerry Howley
A Spy Among Friends
Ben Macintyre
Cassidy's Run
David Wise
The Spy and the Traitor
Spyfail
James Bamford
The Last Soldiers of the Cold War
Fernando Morais
Monkey Morales
Sean Oliver, Ricardo Morales
