Agustín Valverde is an old widower peasant who has always lived in the village of Calacervia, near Zaragoza. One day, he decides on a whim to go and settle down in Madrid. When he arrives in the capital he is caught in the vortex of the Gran Vía's busy traffic. But, even if it is with great dicculty, he manages to reach the apartment of Agustín hijo, his son who has become a renowned doctor. His forty-year-old offspring lives a luxury life there in the company of Luciana, his wife and his daughter Sara. But things are far from ideal : the threesome are annoyed by his uninvited presence while, for his part, Agustín is troubled by the loss of moral values that governs his relatives : frivolity, duplicity and conceit reign supreme among them...