1917, a beautiful apparition of Our Lady forever alters the lives of three children: Lucinda, Jacita and Francisco who lived in Villa Fatima in Portugal.

Irene is an agent for an insurance company. She is given the job of investigating the disappearance of an elderly librarian in a provincial town. During her investigations she meets a history teacher - Ricardo - who knew the librarian and is interested in local legends. Irene happens to hear about a very old medieval castle which, according to legend, has a secret entrance that opens mysteriously on Christmas night as the clock strikes twelve.