In order to win back his girlfriend, Mike Shayne promises to give up his detective practice and get a job as riveter in an aircraft plant. He quickly finds himself investigating the theft of industrial diamonds from the plant's safe and, utilizing a variety of false identities, traces them first to a dress factory and later to a Hawaii-bound ocean liner. Escaping several attempts on his life, he is able to uncover a Nazi smuggling ring, but the location of the missing diamonds continues to elude him.
Lloyd Nolan | Michael Shayne |
Mary Beth Hughes | Merle Garland |
George Reeves | Juan Arturo O'Hara |
Helene Reynolds | Helen Shaw |
Steven Geray | Vanderhoefen |
Henry Victor | Rudolf Hagerman |
Curt Bois | Friedrich Gerber, alias Nappy Dubois |
Marie Blake | Ethel |
Emmett Vogan | Charlie |
Mae Marsh | Mrs. Bertha Toby |
Frank Orth | Mr. Toby |
Ivan Lebedeff | Alexis Fournier |