The Deadly Embrace: Hitler, Stalin and the Nazi-Soviet Pact, 1939-1941

So firmly based upon a close reading of the secondary literature and printed documents, as well as upon archival soundings and interviews, and told with such a sense for the essential drama of the story, that it is easily the most comprehensive and the most interesting history of the Nazi-Soviet pact that we possess. Gordon A. Craig, New York Review of Books"