Capt. Bart Manson is the captain of an oil tanker during World War II, who rescues Katherine Hall when her ship is sunk by a German U-boat. The couple marry, but Manson's ship is subsequently sunk as well. Hall becomes a prime suspect for involvement as she was carrying no identification when rescued. However Manson later discovers that his First Mate Fred Adamson is in fact a German agent responsible for the sinking, and Hall is cleared of any culpability.
