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While in London trying to nab several fugitives who stole a million dollars from a U.S. Treasury vault, American federal agent Dennison (Dennis O'Keefe) assists Scotland Yard Insp. McClaren (Philip Friend) in his search for a missing atomic scientist (Paul Hardtmuth). The detective duo discovers that the key to solving both cases may rest with the scientist's daughter (Margaret Sheridan) and her fascinating diamond.
Featured Crew
| Dennis O'Keefe | Director |
| John C. Higgins | Writer |
| Montgomery Tully | Director |
| Helga Cranston | Editor |
| Maurice Procter | Book |
| Denis Wreford | Art Direction |
| Matyas Seiber | Music |
| Steven Pallos | Producer |
| W. H. Lindop | Sound Recordist |
| Arthur Graham | Camera Operator |