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.
| Directing | Herbert I. Leeds | Director |
| Art | Richard Day | Art Direction |
| Writing | Borden Chase | Story |
| Writing | Samuel G. Engel | Screenplay |
| Writing | Brett Halliday | Story |
| Production | Sol M. Wurtzel | Executive Producer |
| Camera | Glen MacWilliams | Director of Photography |
| Sound | Cyril J. Mockridge | Original Music Composer |
| Art | Lewis H. Creber | Art Direction |
| Costume & Make-Up | Herschel McCoy | Costume Design |
| Sound | Harry M. Leonard | Sound |
| Sound | Alfred Bruzlin | Sound |
| Editing | Alfred Day | Editor |
| Art | Thomas Little | Set Decoration |
| Sound | Emil Newman | Music Director |
