Javier Botet

After a man is seemingly strangled in his bed, criminal psychologist Kate Fuller interviews the sole witness, the victim's eight- year-old daughter, Sophie. When asked to identify the killer, Sophie says, 'Mara.' As Kate digs into the case, she unearths a community of people who claim to be tormented by a shadowy menace, a centuries-old demon who kills her victims as they sleep.

A family lives an idyllic existence abroad until a tragic accident takes the life of their young son. The inconsolable mother learns of an ancient ritual that will bring him back to say a final goodbye. She travels to an ancient temple, where a door serves as a mysterious portal between two worlds. But when she disobeys a sacred warning to never open that door, she upsets the balance between life and death.