Known as "the Devil‘s Son" due to a joke played by his father, Zeca returns to his hometown. There, he meets and falls in love with Maria Rita, whose nickname "Saint" has been spread by her obsessively religious mother, who believes her to have the power to heal and wishes her to live in a convent.

When the cowboy suffers an accident, Maria Rita makes a promise to become a nun in exchange for his cure. Crushed by her decision, Zeca marries his foster-sister Rosinha, who has always been in love with him.

Paradise City. A promise that only love can break.