During World War II Captain Armitage is returning home after a long tour of duty with his crew aboard the Flagship. When they reach port a dashing young officer arrives asking to urgently speak to the Captain. But the two men are not strangers, for the new recruit is the man who broke up Captain Armitage's marriage and ran away with his wife. He delivers the Captain new orders, he and his crew must set an urgent course to intercept and escort a fleet of merchantmen back to England. When one ship fails to join the Convoy Captain Armitage is distraught when he realises the ship, which is being directly threatened by the Nazis, carries his ex-wife among its passengers.
