It is the story of Francisco's worst nightmare. A father who sees how his adolescent and adored daughter Inés is courted by Rogelio, the newly arrived cousin of his sensual neighbor Vanessa. This fact causes Francisco to begin to develop during the day a problem of dissociation from reality (or awake sleep) and sleepwalking at night, where he believes that his daughter has been taken away from him. This situation, together with the doubt about the nature of the relationship he maintains with the neighbor, leads him to madness.