At a party thrown at the Metcalf estate, the Marquise D'Irancy's Sultana diamond disappears when the lights go out during a power failure. Suspected of the crime is William Kirkland, the wastrel son of the wealthy Kirkland family, but William's sister Diana comes to his defense. Aiding her in the investigation is Clamp, a wandering peddler.
William C. Dowlan
Director
Frank Mayo
Clamp
Ora Carew
Diana
Ora Devereaux
Leontine de Vallignac
Harold Miller
James Kirkland
Dagmar Godowsky
Patricia Melton
Bonnie Hill
Marquise d'Irancy
Flora Hollister
Truman Van Dyke
Ray Ripley
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