Eddie Chapman was a charming criminal, a conman and a philanderer; he was also one of the most remarkable secret agents Britain has ever produced. Recruited in occupied Jersey by the German Secret Service at the start of the Second World War, Chapman became a highly prized Nazi agent. But throughout the war he secretly spied for Britain, as Agent Zigzag. Inside the traitor was a man of loyalty; inside the villain was a hero; the problem for Chapman, his spymasters, and his lovers, was to know where one ended, and the other began. In 1941, after training at a secret German spy school in occupied France, Chapman was parachuted into Britain with a revolver, a wireless, and a cyanide pill. His mission was to blow up the factory producing Britain's Mosquito light bomber. Instead, he contacted MI5. For the next four years, Chapman worked as a double agent, a lone British spy at the heart of the German Secret Service. Chapman supplied MI5 with crucial military information from occupied France, Norway, neutral Lisbon, and Berlin, espionage that helped to change the course of the war.