Mark Russell, captain of a ship sailing from the South Seas to San Francisco, is an innocent victim of a pearl-smuggling scheme by Harry Gibson, and when the pearls are discovered by customs inspectors, Russell takes the blame because of his love for Gibson's sister Eve and to shield her of being disgraced.

Northwest Mounted Policeman faces many obstacles in attempting to apprehend a murderer. He miraculously escapes ambush and learns of the dying murderer's name. After a thrilling fight he secures a confession from his man and saves the girl from disaster.