David Kahn – universally regarded as the dean of intelligence historians – recounts the desperate efforts to gather information during World War II and the Cold War. In 

How I Discovered World War II's Greatest Spy and Other Stories of Intelligence and Code

Kahn provides insight into the dark realm of intelligence and code. By revealing the past, this work helps guide present and future intelligence efforts. Kahn is the author of The Codebreakers and Seizing the Enigma: The Race to Break the German U-Boats Codes, 1939-1943, which was the basis for the movie U-571.