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.

• Gibraltar Films Ltd.
• Gibraltar Productions
• Dennis O'Keefe
• Margaret Sheridan
• Philip Friend
• Alan Wheatley
• Francis de Wolff
• Eric Berry
• Gudrun Ure
• Seymour Green