6x13 - Little House on the Prairie

A 17-year-old budding criminal named Tod Dortmunder is sent to Walnut Grove to live with his grandparents after his mother loses patience with his ill-tempered behavior. His behavior becomes more violent, and when he is caught stealing Charles' watch, the grandparents (in part because they fear for their safety) turn to Charles for help. Charles proves to be the role model Tod never had, and efforts to rehabilitate the lad seem to be working. But even Charles is unaware of some dark secrets from Tod's childhood that don't surface until he destroys the present he gave him.