At a time when the Cold War spying game was in full swing, Oleg Gordievsky was one of the KGB's rising stars...and biggest traitors. For years, he provided top-secret Russian intelligence to the British, but he is best remembered for risking his life in 1983 to pull the world back from the brink of nuclear annihilation. Presented by host Damian Lewis and backed by firsthand accounts by Gordievsky himself, we detail the spy's incredible career as a double agent and his gripping defection out of Russia.