Two separate episodes that have in common the door which separates good from evil. In the first segment, "Alguien al teléfono", Ángel Magaña tries to avenge the death of his sister, a girl who commits suicide over gambling debts. In the second, "El pájaro cantor vuelve al hogar", Roberto Escalada is a former inmate who whistles when commits crimes, and returns home where he is expected by his blind mother, who believes he has regenerated.