With the end of the war, the victorious Germans now occupy a defeated Great Britain. In London, decorated detective John Henry Rossett, now reporting to the Nazi victors, lies in a hospital bed recovering from gunshot wounds. Desperate to avoid blame over the events that led to the shooting, his boss, Ernst Kohler, covers up the incident. But when Koehler's wife and daughter are kidnapped by American spies, the terrified German turns to the only man he trusts to help him - a shrewd cop who will do whatever is necessary to get the job done: John Rossett.