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.
Directed by Herbert I. Leeds
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Cast

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

Wade Boteler
Judge

Charles Trowbridge
Capt. Brown
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