In this dramatic and uncanny story, Lefty Bill Ranger is an Alaskan mail carrier. Lefty Bill Ranger reaches Circle City one night in a terrific snowstorm. There he meets Menneval -- a man who is widely feared throughout the territory -- and is offered a job. He is to go to Tuckerville, California, and from there to the mountain fastness where Peter Crosson and his son Oliver live in total isolation. Menneval wants Ranger to watch and report what he sees for a period of six months. The pay for this espionage will be $6,000 in gold. Ranger, attracted by the money, accepts the assignment. In the Sierra Mountains Ranger sets up his camp and, pretending to be a trapper, keeps the Crosson Ranch under surveillance. Ranger is amazed to witness a gigantic mountain lion, pursued by a pack of wolves, followed by a bronzed youth on horseback.
