Tula, 31-year-old unmarried woman, whose sister had just died, decides to live in the house of her brother-in-law, Ramiro, a bank employee, and his two children. When she takes control of their lives, she plays the role of wife-mother, but does not accept the sexual commitments or maternal responsibilities of her new role. Ramiro likes her because she adores his children, but she rejects his courtship. Desperate Ramiro tries to rape her and the priest advises her to marry Ramiro. Tula insists on maintaining platonic relations, but instead of leaving the city from their home, she decides to take them to her village and, with the presence of relatives, redirect Ramiro's feelings to the memory of her deceased sister. Ramiro rapes Tula's young cousin, Juanita at the earliest opportunity, but the rest of the family does not know until months later it becomes obvious that Juanita is pregnant. Ramiro is forced to marry her, taking his children and new wife from the provinces to the city.