A paranormal puzzle smoulders in the desert heat of southern Arizona. At the home of Jack and Chloe Monroe, a written message "Leave Now" appears then disappears, a candle in an empty room mysteriously lights itself, and - most enigmatically - an unidentifiable ethereal whisper begins to permeate the house. What was once simply strange now feels sinister. What once seemed a curiosity now seems terrifying.

Dr. Luke Jackson, a British Parapsychologist visiting family nearby, is asked to investigate and quickly finds himself drawn deeper into the series of unexplained events. Time is...