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.

Genres

Cast

Peter Lorre

Kentaro Moto

Warren Hymer

Twister McGurk

Amanda Duff

Joan Castle

Robert Lowery

Lt. George Bentley

Leon Ames

Commissioner Madero

Jean Hersholt

Mr. Sutter

Douglass Dumbrille

Comdr. La Costa

Richard Lane

Police Commissioner Gordon

Charles D. Brown

Capt. Thomas Castle

Paul Harvey

Gov. John Bentley

Eddie Marr

Capt. Dahlen

Harry Woods

Grant