While getting into his car on the evening of February 16, 1978, the chief of the CIA's Moscow station was handed an envelope by an unknown Russian. Its contents stunned the Americans: details of top secret Soviet research and development in military technology that was totally unknown to the United States. From David Hoffman, the Pulitzer Prize-winning author of The Dead Hand, comes the riveting story of the CIA's most valuable spy in the Soviet Union and an evocative portrait of the agency's Moscow station, an outpost of daring espionage in the last years of the Cold War. Drawing on previously secret documents obtained from the CIA, as well as interviews with participants, Hoffman will reveal how the depredations of the Soviet state motivated one man to master the craft of spying against his own nation until he was betrayed to the KGB by a disgruntled former CIA trainee. No one has ever told this story before in such detail, and Hoffman's deep knowledge of spycraft, the Cold War, and military technology makes him uniquely qualified to bring to the International Spy Museum this real life espionage thriller.