During World War II there was a separate war of infiltration and misdirection, espionage and assassination, and the Nazis were determined not to let anyone best them. Many of these operations remained top secret, and were revealed only years after the war. Revealing the full extent of these secret intelligence networks, Charles Whiting explains the role of the Abwehr—Germany's military intelligence bureau—and features interviews with key figures like Hermann Giskes, who fooled the Americans at the Battle of the Bulge, and Nikolaus Ritter, who stole the highly classified U.S. Norden bombsights.