Little Joe is witness to a murder in a barbershop. He is friends with the victim's young son and takes him under his wing. Much of the episode is taken up with their struggle for some kind of justice for the dead man. But it also explores the difference between justice and vengeance, and how a structured society must abide by the rule of law if it is not to disintegrate. This is particularly true of the Wild West in the 19th century, where life is cheap and men lived and died by the gun.
Joe's relationship with the boy is sweet and caring, and his anger towards the murderer is always simmering in the background. He learns some important life lessons of his own with the help of his wise dad. You can see that Joe's duty of care for the boy helps him to mature himself.
The episode is worth seeing for the final scene where Joe inflicts some justice of his own. It is impossible not to laugh with satisfaction at an otherwise serious and sad story.