In Puerto Rico to investigate a glut of contraband diamonds that are flooding the world's jewel market, Mr. Moto and his sidekick, a wrestler, find themselves involved in murders by thrown daggers, the frame-up of an overstressed Army colonel, and a pirate gang led by an unknown boss who has inside knowledge of the ensuing investigation.
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Verdict: Unknown
> Herbert I. Leeds (Director)
> William Forsyth (Assistant Director)
> John W. Vandercook (Novel)
> John P. Marquand (Characters)
> George Bricker (Story)
> Peter Milne (Screenplay)
> John Reinhardt (Story)