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In 1973, 591 American POWs returned home from the Vietnam War, bringing with them harrowing tales of survival. But there was an even more remarkable -- and secret -- story to tell: a feat of incredible spycraft that remained classified for decades...until now. This is the unbelievable story of James Stockdale and his fellow prisoners at the notorious "Hanoi Hilton." Their clandestine communications with U.S. intelligence alerted the CIA and Pentagon to the horrors of the Vietnamese POW camps and prompted a daring, top-secret rescue mission.