US Marshall Piedmont Kelly is looking into a year-old murder after a gold watch with an inscription linking it to a dead rancher, Albert Bourbonette, is discovered by a constable. Intrigued by the first clue in the murder, Kelly's determined to get to the bottom of it. The watch was found in the pocket of a man killed in a saloon confrontation. Witness descriptions lead Kelly to the two remaining Bourbonette brothers, who may be trying to track down...