Watkins, Richard Howells "Action Offshore"

Collier’s tag line: “A stowaway has a good memory for faces – especially Nazis.” Set aboard the American freighter MARY McNALLY on a North Atlantic voyage. Second Mate Tom Ruddock discovers a stowaway and learns that his Captain and several others aboard the ship are actually Nazis intent upon delivering the vessel and its petroleum oil to a German submarine in mid-ocean. Similar in plot to Raine’s “Mr. Gallup Gathers No Moths” which was published a year earlier. Was this Germans-secretly-taking-over-an-American-ship tale a World War 2 equivalent of an “urban myth” ?