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.

Crime, Mystery, Thriller, Action

Peter Lorre, Warren Hymer, Amanda Duff, Robert Lowery, Leon Ames, Jean Hersholt