Half-Life: The Divided Life of Bruno Pontecorvo, Physicist or SpyMP3 CD, 24 May 2016

The memo landed on Kim Philby's desk in Washington, DC, in July 1950. Three months later, Bruno Pontecorvo, a physicist at Harwell, Britain's atomic energy lab, disappeared without a trace. When he re-surfaced six years later, he was on the other side of the Iron Curtain.