On a warm July evening in 1985, a middle-aged man stood on the pavement of a busy avenue in the heart of Moscow, holding a plastic carrier bag, printed with the red logo of a British supermarket. The man was a spy. A senior KGB officer, for more than a decade he had supplied his British spymasters with a stream of secrets from deep within the Soviet intelligence machine. No spy had done more to damage the KGB. A tale of espionage, and raw courage that changed the course of the Cold War forever...