Marshal Steve Donovan and his Deputy Rusty Lee go to the town of Daly City to investigate the murder of marshal Hal Grant. There they find the town living in fear of Ma Faulkner, her two sons, and a gang of renegades led by a man named Mapes.; A gang is robbing post offices. Steve Donovan and Rusty Lee are given the job of bringing them in and are assigned a new marshal, Jim Allison, who is on his first assignment. The new marshal is out to prove himself and causes problems by not working as part of the team.; Tricks of handling a six-gun, including "road agent's spin", "roll", and "border shift".; Facts about early railroads in the West.