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.
Unfortunately the movie The Diamond Wizard is not yet available on HBO Max.
| Directing | Dennis O'Keefe | Director |
| Writing | John C. Higgins | Writer |
| Directing | Montgomery Tully | Director |
| Editing | Helga Cranston | Editor |
| Writing | Maurice Procter | Book |
| Art | Denis Wreford | Art Direction |
| Sound | Matyas Seiber | Music |
| Production | Steven Pallos | Producer |
| Sound | W. H. Lindop | Sound Recordist |
| Camera | Arthur Graham | Camera Operator |
| Production | Charles Leeds | Production Manager |
| Costume & Make-Up | Charles Nash | Makeup Artist |
| Directing | Adele Reynolds | Continuity |
| Sound | Matyas Seiber | Conductor |
| Camera | Gordon Lang | Director of Photography |
| Directing | Jim O'Connolly | Assistant Director |
