Frank Hawthorne is placed in prison to persuade a convicted Irish safe-breaker to break into a safe in the German Embassy in Rome and retrieve some essential documents.
Frank Hawthorne helps the Dutch underground sabotage a German U-boat under repair in a Dutch port. When the first attempt fails, the Germans place a number of Dutch hostages on board.
Captain Frank Hawthorne has been ordered to Schweinfort to find out who has been leaking information to the enemy. Bailing out during an air raid, he wakes up in what appears to be a U.S. army hospital.