During World War II, a female survivor of a German U-boat attack marries the skipper of the American merchant ship that saved her but is suspected of being a spy who sends secret data about Allied ship movements to the Germans.

Oil-tanker Captain Manson rescues Kathie Hall after her ship is sunk by a U-boat and he ends up marrying her. When his ship is sunk and she is suspected because she has no identification, Manson tries to clear her of the charge and discovers that his first mate, Adamson, is a German agent.—Ed Stephan <[email protected]>