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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.
Directed by William C. Dowlan

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

Esther Ralston
In the Heat of the Night
1967