Four of a Kind - S2.E16

Years after the town hooligan and three of his men murder a young woman's husband simply for beating them at poker, she returns with the Dead Man's Gun, seeking revenge. She leaves an Ace at each dead man's side, and soon a showdown is set up with the hooligan and his son. After being injured she enlists the help of the town's shopkeeper, a victim of the town's gang's treachery for years, and his young daughter.

The hooligan waits for her to show up to ambush her, but she cleverly kidnaps his son instead and forces him to come to her, at her old ranch, where her husband had been murdered so long ago. Here he finds his son in an unexpected predicament, and she forces him to face his deepest, darkest fears. Then she goes back to town to marry the shopkeeper and to be the littler girl's mother.