It's Josephine's 12th birthday, and she and her farmer parents go into a small Western town for a treat. But her parents are murdered by a group of carousing cowboys, including the son of a rich local resident. When the son shows up at the sheriff's office the next day to explain away the circumstances, Josephine takes the sheriff's gun and shoots the son dead. As a result, his rich father insists she hang - especially when he finds out she's kin to a famous retired gunfighter, Ethan Fuller. Ethan Fuller shows up in town to break Josephine out of town and take her someplace safe, but they re pursued relentlessly by possies and hired gunmen, and Ethan has to make a last stand and answer for his past crimes in order to save his only remaining family.