Walter G. Krivitsky, the master spy, was a small, dapper and very nervous man who happened to be the first and one of the key defectors to warn the West early on abou the Stalin regime. He became friends with Whittaker Chambers, encouraging him to come forward and thus precipitating the Alger Hiss case. After publishing the story of his life as a Soviet spy, Krivitsky was found dead in a hotel room in Washington, D.C., an apparent suicide. Was he in fact murdered?