Tula, an attractive spinster, invites her brother-in-law Ramiro, a bank employee, and his children, Tulita and Ramirín, to share her home after the death of her sister Rosa. She enjoys the role of protector but gradually becomes disturbed by the jealousy that arises between Ramiro and her suitor, Emilio. Her deep-seated fear of men, conditioned by religious principles and the morality of her social class, surfaces as the widowed Ramiro becomes increasingly aware of her sexual presence and attempts physical displays of affection. She coldly rejects his marriage proposals and decides to leave the household for a vacation at the nearby home of her uncle Pedro. During this sojourn she softens and considers marrying Ramiro. In the meantime, however, Ramiro gives way to desire and seduces Pedro's teenage daughter, Juanita; he then accepts the social consequences of his action by marrying the girl. Tula bids good-by to the couple at the train station and wanders off alone.