Mike Shayne battles smugglers and spies to keep them in the U.S.A. It's his most dangerous assignment!
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.
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Michael Shayne
Merle Garland
Juan Arturo O'Hara
Helen Shaw
Vanderhoefen
Rudolf Hagerman
Friedrich Gerber, alias Nappy Dubois
Ethel
Charlie
Mrs. Bertha Toby
Mr. Toby
Alexis Fournier
