British Intellengence dispatches Commando Geoffrey Carter on a one-man raid to destroy a munitions plant that manufactures bombs in Nazi-occupied France. He enlists the aid of a patriotic farmer, M. Bonnard, that lives near the plant, over the objections of his daughter Odette Bonnard, who believes that the British were responsible for the fall of France. Her attitude softens toward Carter, who is living with the family as posing as a son, but Odette cannot bring herself to aid in Carter's plan because of her fear of reprisals against her family. She turns informer and the Nazis capture Carter.