Covert operations. Military secrets. Spy rings and code breakers. Some of the most interesting spy stories have emerged from World War II to the fall of the Soviet Union. This book retells the history of the world’s key undercover operations through firsthand accounts, including the early formation of the CIA and the secret language Navajo code talkers used during World War II to help U.S. Marines fight against the Japanese. Learn more about history’s famous real-life secret agents, their tools and methods, and today’s spying techniques.