A brisk, dramatized biography of William Stephenson, the Canadian spymaster who ran clandestine intelligence and deception operations from New York and London during World War II, organizing sabotage, counter‑espionage, and liaison among Allied services; it portrays his creation of British Security Coordination, his role in shaping U.S.–British intelligence cooperation and the OSS, and the bold, globe‑spanning plots and personal risks behind efforts to infiltrate Axis networks and influence wartime strategy.