During World War II, American officer Tom Jeffords (James Franciscus) joins a British torpedo boat stationed in the Mediterranean Sea. Under the direction of Cmdr. Ashurst (Ronald Allen), the Royal Navy patrols the blockaded coast of Malta and repels nearby German ships. When Alison (Elizabeth Shepherd), Ashurst's neglected wife, becomes enamored of Jeffords, the ship's balance of power is thrown into question. The two men must resolve their differences before attempting an important mission.