During a cold night, the nine year old Ana has room invaded by an evil spirit: the Costureiro (Tailorman), who seeks an innocent soul. She is only safe when within her blanket, wich the creature can not trespass. She offers her kitten, Duquesa (Duchess), as a way to escape with life. But to protect herself, and her pet, Ana must seek how to destroy this creature, and the answer may lie on an old book of folktales: O Limiar da Meia-Noite.