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.
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The Diamond is a 1954 British film noir crime film directed by Montgomery Tully, and starring Dennis O'Keefe, Margaret Sheridan and Philip Friend. The screenplay was by John C. Higgins, based on the 1952 novel Rich Is the Treasure by Maurice Procter. It was released by United Artists in Britain and in America, where it was known as The Diamond Wizard.
