Best Mystery Movies of 1920

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.

Small town politician and banker Brent Warren (Robert McKim) is responsible for a murder, but only George Roan (Joseph J. Dowling) is sent to the gallows for it. Roan, however, is resuscitated after he is hung and proceeds to secretly haunt Warren's life. District attorney Cullen Grant (Roy Stewart) is sure that Warren was behind the killing and has him arrested. Warren's fiancee, Dare Keeling (Fritzi Brunette), also happens to the Grant's ex-sweetheart, and she believes in his innocence. Her brother, Larry (George Fisher), however, isn't so sure and he goes to work as Warren's secretary.

A man and two women, suspected of stealing bonds, are traced to a country hotel. While Judith, one of the women, is out horseback riding, the other two, Walter and Vera, are arrested. When, during a storm, Judith is injured in a fall from her horse, Boone Pendleton comes to her rescue. Soon the river becomes impassable, and they are trapped in Boone's cabin, where the two fall in love.