The Cold War meets Mad Men in the form of Karel Koecher, a double agent whose shifting loyalties and over-the-top hedonism reverberated from New York to Moscow.In the mid-1970s, the CIA and KGB were both watching Karel Koecher closely—and they were both convinced he was working for the enemy. They were both right. Traveling with his wife, Hana, Koecher posed as a Czechoslovak asylum seeker and arrived in the US as a Communist sleeper agent. After parlaying...