A big gunman (Clint Eastwood) came to a small town on the Mexican border. He learned that the two irreconcilable gangs in the town, the Rojo brothers and the mayor Baxter, had been fighting for a long time, so he decided to mediate with the two factions to eliminate the evil forces in the town and restore the peace of the town. He witnessed the Rojo brothers robbing and killing a team of soldiers and occupying gold privately, so he used two soldiers' bodies to attract Baxter to find evidence of the Rojo brothers' crimes. At the same time, he revealed the news to the Rojo brothers, which led to a fierce gunfight between the two sides. Joe found the gold during the fierce battle between the two factions and found Marisol, a woman imprisoned by the Rojo brothers. He gave Marisol to Baxter in exchange for his son Antonio who was captured in the fierce battle. But later he learned that Marisol was seized by Raymond of the Rojo family, so he tried to rescue her and help her escape from the town with her husband and children. Raymond, who loved Marisol, found that his beloved woman was let go, and he believed that it was the Baxter family who did it, so he launched a crazy revenge. Who will be the winner between the two gangs, and can the middleman, the Dartgun, realize his plan to restore peace to the town?