In the heart of the Albaicín, Granada's old Moorish quarter, a ruined house holds a secret that has been silenced for more than a century. At the beginning of the 20th century, a wealthy family disappeared without a trace after requesting the services of a Jesuit priest specializing in exorcisms. Rumors spoke of voices in the early morning, shadows crawling on the walls, and a little girl who spoke in ancient languages.

Today, that house is once again occupied by a young couple restoring it. But what begins as an architectural project soon turns into a nightmare when they find a diary hidden behind a beam in the attic. It recounts the details of an exorcism that ended in tragedy... and of an entity that never left.