Montana Territory.

John Malvin , prospecting the Montana territory during the gold rush, sees bandits kill a miner and his son. He eludes the outlaws by hiding near a stagecoach relay station run by "Possum" Enoch and his daughter Clair, with whom John Falls in love with. Sheriff Henry Plummer, secret head of the outlaws, learns John witnessed the killings and sends him as his deputy on a dangerous mission with a planned ambush.