When an American officer who knows the time and place of the D-Day invasion disappears on German-occupied Jersey, the Allies choose Harry Martineau to direct the rescue mission.

Two brothers--one American, the other German-- fight World War II on opposite sides as pilots. They are twins who were separated when their American father died and the German mother returned home with only one. The German is ordered to impersonate the American in a plot to assassinate an American general.