The marshal is compelled to arrest his brother-in-law for accidentally shooting a Mexican. His wife pleads for his release, but it is ineffectual. When he is asleep, she takes the calaboose keys from his pocket, but finds that the prisoner has been helped out by a half-breed. The marshal is awakened by her return and discovers that his keys are gone. He finds them in her possession, concludes she has released her brother and follows the trail into the desert. The half-breed "gets the drop" on the marshal, and is about to finish him, when the prisoner intervenes and saves him. The half-breed then steals all the horses and leaves them marooned in the desert. The prisoner proves true blue and finally gets the marshal back to his wife and friends. As a game man, he eventually gets the half-breed that perforated him while in the performance of his duty.