Reese and Cotton Buckmeister are sent to San Diablo to help with bandits who repeatedly hit the town. Upon arrival Reese stops Ben Slick and Dandy Davis who are bullying the patrons of a bar. Dandy is taken prisoner and Slick is sent packing. Don Julio asks Reese to stay in the town to train a local militia so they can protect themselves while Cotton returns with Dandy to Laredo. Reese finds himself the center of attention in the town and with the affections of Lupita. Being a bit jealous Cotton returns with his prisoner who lets slip to Gonzales that Reese is really after hidden treasure. Gonzales and Apache Annie allow Cotton to believe he has found a map to the treasure while the town and Gonzales turn on Reese leading to him being ousted as their leader. But when Slick returns with friends to take the town and Cotton as prisoner, Reese is caught in the middle with few options.