Based on the true story of Juan Pujol Garcia, an eccentric double-agent who, with no military or covert training, somehow persuaded both the Germans and the British to hire him as a spy. As it turned out, his real allegiance was to England, and working closely with MI5, he created a fictional network of 27 spies said to be spread out over England, Scotland, and Ireland. His ruse enabled the English to deceive the Germans about the invasion of Normandy.