I recently finished reading Spycraft, Robert Wallace and Keith Melton’s chronicle of the CIA’s spy tech divisions, specifically OTS (Office of Technical Services), the division responsible for creating technical espionage gear. Things like eavesdropping devices, dead drop containers, secret writing, disguises, and document forgery.

The story of OTS is fascinating and full of all sorts of straight-out-of-the-movies espionage games and tactics. The book is chock full of anecdotes of crazy operations from the group’s inception with OSS during World War II, through the years of the Cold War. For evidence, look no...