Part of the documentary series examining real-life stories of courage and self-sacrifice. This volume looks at the incredible careers of some of most courageous spies to have served during the Second World War, including the Norwegian group who kept watch on German naval movements through the fjords and passed the information directly to British Admiralty intelligence. Also featured are the agents who were dropped into occupied France either by parachute or by light aircraft, and the resistance groups who formed overnight in the European countries overrun by the Nazis.