A young outlaw gets involved with a gang of crooks. When he tells them he is breaking away, they threaten to pin a false murder charge on him. But he is rescued and reformed by his sister, and an undercover agent for the express company.

Knowing the railroad is coming, Carter is after the rancher's land. Bob and Chito return just in time to save Banker Stockton and his money from Carter's men. When Stockton then lends the ranchers money, Carter has them burned out. Bob knows Carter is responsible and when Carter's henchman Saunders is recognized, Bob goes into action.