Juan Sayago returns to his hometown after 18 years of being in prison, accused of killing Raul Trueba, a horse dealer. Juan wants to live peacefully, but knows that Julian and Pedro, Raul’s sons, had sworn to seek revenge for their father. Juan visits Mariana, a widowed woman who used to be Juan’s girlfriend. Everybody’s advice to Juan is that he needs to leave town. Mariana and Juan renew their love but she doesn’t want to leave with him. Julian challenges Juan to a duel in the same place Trueba died, Juan dresses as a gunman, says goodbye to Mariana and puts on glasses to kill his enemy. Exasperated, Pedro challenges Juan, who turns his back on him, and so the young man must shoot enough with his brother’s gun to hit him down.