The official, never before told, account of Brooks's wartime service as an undercover agent. After the war, he continued to serve with MI6, and so was constrained not to relate any of his experiences. His is an exciting story; time and again he was faced by danger and incipient disaster. He brushed shoulders with some of the worst traitors of the Second World War, and was targeted by the Gestapo, who came within an ace of entrapping him.