G-Man Ted Riley is ordered to investigate happenings at Diamond Island, where a bogus Major Gray is reported engaged in manufacturing a new brand of secret gas for his own purposes. Riley blows up his motor boat just off the island and is picked up by Gray's men. On the island he discovers chemist Professor Baker (John Cowell) and his daughter, Anne, are held captive by Major Gray.
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CAST
Lloyd Hughes
Ted 'Rip-Roaring' Riley
Marion Burns
Ann Baker
Grant Withers
Major Gray
Eddie Gribbon
Sparko - Henchman
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