El zurdo

Cowboy Pedro is attacked by murderers and robbers in a game of cards. The weapons skill saves his life, and he remembers the face of one of the attackers. On the way out of this inhospitable town, he meets a boy who asks for help his wounded father. Pedro agrees, but to do something already too late. The boy's father dies, and the little Mario remains an orphan. Pedro and Mario swearing revenge on the killers, but first you have to find them