A pretty young milliner and her grandfather are suspects in a plot to loot the Wells Fargo office.
Pat and a distant cousin are informed that they've co-inherited a ranch which some unscrupulous people covet because of its valuable grazing land.
Outlaws planning to rob Mineral City and seeking hostages attack members of the archeological expedition from the state university. Roy comes to the rescue.
Roy and his friends round up a gang headed by the sheriff's brother, who tries to steal an old prospector's savings.
Orphaned teenager Jerry King has fallen in with Colt Eggers and his outlaw gang who commission him to murder Roy. Gradually, Roy takes Jerry into his confidence and wins him over to the side of law and order.
An old Western legend has it that anyone who sees the ghost of ""One-Arm Johnny"" will be murdered. Roy and his friends investigate and prove the legend has no sound basis.
Two irate trappers murder a government agent after he orders an end to beaver trapping in the regin. Pete the peddler a distant cousin of Pat Brady, is later urged to sell the illegal pelts.
Two crafty old codgers arrange to have a strongbox stolen from their own transportation company. The thieves steal Nellybelle in order to haul the loot, thus putting Roy, Dale, and Pat on their trail.
A gang of bandits robs city hall of tax money and escapes in Dale's wagon, which also carries a small baby as a passenger.
Rod Miner, an incorrigible outlaw, returns to his native Mineral City, where his father runs the general store. He is soon pursued by Silver City Marshal Bill Culver, whom he bushwhacks before plotting a means to get rid of Roy.
A ten-year-old orphan called ""Jiggers"" Riley uses a squirrel rifle to frighten Roy and Dale away from the gold mine being illegally operated on government land by the boy's treacherous uncle, Jasper.
Sheriff Tom Blodgett is shot while investigating a rustling gang. When Deputy Morgan seems to hinder attempts to apprehend the gang, Roy realizes that he is in cahoots with them. When Roy, Dale, and Pat are subsequently trapped, Nellybelle actually saves the day by overpowering the badmen.
Sarah Granby, proprietress of a hand laundry, is in cahoots with an unscrupulous man higrading ore.
Roy breaks up a land racket after a local newspaper runs a story questioning a property sale.