The "Cambridge Five" betrayed their country to the Soviet Union during and after WWII. Fifteen years after 76-year-old Edward Crane is pronounced dead at a London hospital in 1992, academic Sam Gaddis learns that Crane was the oft-rumored sixth man in the Cambridge spy ring—and that he's alive and ready to tell his story. Gaddis, a well-regarded scholar of modern Russia who needs money to support his ex-wife and their daughter, thinks he can turn this bombshell into a bestselling book. But the people who know about it, including one of Gaddis's best friends, journalist Charlotte Berg, are turning up dead—and the intelligence agencies in Britain and Russia would prefer to squelch the story.