Gene and Pat meet Pepito, a little Mexican boy who claims he knowns about a gold strike known as the Lost Chance. On their way into town, Gene finds out that the Cattlemens Association fund is short. Some members of the Cattlemens Association are really outlaws, and when they find out about this Lost Chance, they kidnap Pepito and make him lead the way to the Lost Chance, or else, they'll kill his mule, Amigo. Gene rides after the outlaws, and capture them, and saving Pepito, and Amigo.

Gene and Pat are called in to track down the ""Black Rider"", an outlaw who wears a black suit and hat. The outlaw is terrorizing the town, and plans revenge on the town for an execution of a killer. The sheriff is wounded, and Gene assumes the job. As it turns out, the Black Rider is a woman! Pat discovers this, and rides to tell Gene, who sneaks over to the outlaw's property. Gene (with the sort of help from Pat), Gene is able to capture this Black Rider when she doesn't expect it.