The Diamond Wizard

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.

• Montgomery TullyDirector
• John C. HigginsWriter
• Dennis O'KeefeDirector

• Dennis O'KeefeJoe Dennison
• Margaret SheridanMarline Miller
• Philip FriendInsp. McClaren
• Alan WheatleyThompson Blake
• Francis de WolffYeo
• Eric BerryHunziger
• Gudrun UreSgt. Smith
• Seymour GreenLascelles
• Paul HardtmuthDr. Eric Miller
• Colin TapleySir Stafford Beach
• Michael BalfourHoxie
• Cyril ChamberlainCastle