 In old Spanish California, dashing cattleman Juan Obregon returns to the rancho of his friend Gaspar Melo, to find he s fathered a son on Rosa, one of Gaspar s identical twin daughters. Overjoyed, he plans to formalize his "unofficial" marriage. But trouble brews; Melo s land is of unclear title and the new Don Domingo hopes to grab it for his own profit. Violence results. Without even knowing who survived, Juan (accompanied by Rosa s tomboy sister Tonya) rides for revenge, through spectacular pastoral and wilderness scenery.