Little Javier and his mother get to live in an old and deteriorated mansion, which is inhabited by the housekeeper, her husband and the owner Don Gregorio, who is a mysterious man that lives in seclusion in one of the rooms. Javier will have to deal with loneliness since his mother works at night and sleeps during the day. At nightfall, just 13 minutes before bedtime, Javier begins to experience terrifying hallucinations. In them, terrifying entities and forces of evil, torment and take the lives of people unknown to Javier. Everything seems to be connected with Mexican horror tales.