
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.

as Kentaro Moto

as Twister McGurk

as Joan Castle

as Lt. George Bentley

as Commissioner Madero

as Mr. Sutter

as Comdr. La Costa

as Police Commissioner Gordon

as Capt. Thomas Castle

as Gov. John Bentley

as Capt. Dahlen

as Grant

as Sailor Sam - Wrestler

as Moore - Governor's Aide

as Librarian

as Launch Pilot

as Mrs. Brown

as Doctor at Hospital

as Drunk

as Real Ambulance Intern

as Ship's Officer - Fight Referee

as Driver

as Cop with McGurk

as Carlos - Butler

as Ship Dispatch Officer

as Sailor at Wrestling Match

as Doctor

as Washington Official

as Sergeant holding McGurk at the Garage

as Officer

as Hotel Valet

as Hotel Valet

as Flirt at Dance

as Nurse

as Guard

as Henchman disguised as Ambulance Attendant

as Henchman disguised as Ambulance Attendant

as Sailor at Wrestling Match

as Real Ambulance Intern