Download or read book Double Agent written by Peter Duffy and published by Simon and Schuster. This book was released on 2014-07-22 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: An account of a virtually unknown pre-World War II counterespionage operation describes how naturalized German-American agent William G. Sebold became the FBI's first double agent and was a pivotal figure in the arrests of 33 enemy agents for the Nazis.