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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.'

Under Northern Lights Synopsis

Douglas MacLeod of the Royal North West Mounted Police is in love with Suzanne Foucharde, who has adopted an abandoned Indian baby, the illegitimate child of Louis La Rocque and Na Fa Kowa. When La Rocque insinuates that the baby is Suzanne's, her brother Henry defends his sister's honor and kills the villain. In spite of his love for Suzanne, it is Douglas' duty to arrest Henry. He does so, but later allows him to escape, taking the bullet himself that was fired after Henry by Constable Burke. Meanwhile, the dead body of Na Fa Kowa is found, accompanied by a note proving that the Indian was the baby's mother. In the spring, when Douglas recovers from his wounds, he and Suzanne are married.