Rob Ralston is forced to go to "town" for supplies, and "Injun" Jim, a sneaking rascal, announces that he proposes to jump his claim. This arouses the official ire of Fred "the star wearer," and he soundly trounces the half-breed rascal. Now Fred has an intrepid sweetheart. Sally, who is a well-spring of information and is naturally hated by law-breakers. "Injun" Jim gets reinforcements and carries off the girl as a hostage. Fred senses they are making for the mine, so he girds on his guns and goes in the same direction. The desperadoes arrange to "dynamite" Sally, but she cuts the fuse in two by a well aimed shot after they have sought safety at a distance. This saves her sweetheart Fred, who rushes to her rescue, and they both retreat to a cabin. The dynamiters are obstinate and place another cartridge, so that the cabin will be blown to pieces. The daring Fred picks up the keg of powder and rushing out rolls it down on Injun Jim and his fellow mischief-makers. They are so dazed from the effects of the explosion that they find themselves in irons' when they recover consciousness, and Fred single-handed delivers them to the authorities.