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The House Without a Key Synopsis

A Pathe serial in ten chapters of two-reels each: Dan Winterslip, a wealthy man in Honolulu, has not spoken to his brother, who owns a hotel next to Winterslip's estate, in over twenty years. Minerva, sister to the estranged brothers, comes from Boston to try to reconcile the two men. John Quincy Winterslip, Dan's nephew, receives a letter instructing him to retrieve a box from an attic in San Francisco and dump the contents into the ocean. He is on board a ship bound for Hawaii in which other passengers are also after the box. Dan Winterslip is murdered. Charlie Chan, a Chinese detective, offers to help solve the killing and the mysteries surround the box. Chan is looking for the person whose wristwatch is missing the number 'three.'

Cynthia of the Minute Synopsis

While in New York seeking work, Cynthia, a young English girl, meets Bruce Crittenden and George Rhode who introduce her to Madame Savarin, a wealthy woman seeking a companion for a sea voyage. She hires Cynthia, and while at sea, Cynthia discovers that Bruce is the ship's purser. Cynthia's father was a famous wireless expert who taught her how to read code, which enables her to overhear a plot to sink the ship and steal Mrs. Savarin's jewels. Soon after, the crew mutinies, and while Rhode and Bruce fight the crew, Cynthia sounds the alarm. As he is attempting to foil the jewel thieves, Bruce falls overboard, and Cynthia swims to his rescue with the jewels strapped to her back. They are rescued by a government patrol boat and taken back to New York where Cynthia and Bruce are married.