The Raymond family moves to a remote area of Canada, where their blind 7-year-old son Luke reveals he has an imaginary friend named Pyro who tells him what to do. At first Pyro's instructions seem harmless, but Luke's behavior and descriptions of Pyro become increasingly disturbing and violent. One day Luke drags a blood-soaked, unconscious man into the house, leading his parents to realize Pyro is not imaginary and that something dangerous is influencing their son.