Psychiatrist Dr. Harper sits down with a new patient, Lester Billings, who describes the grisly deaths of his three children over the course of several years. When his wife takes a short trip, a sinister presence stalks Billings and his child. Amidst his panic, Billings leaves his child alone for a moment and later discovers the child strangled to death. As Billings concludes his tale, he soon learns an eerie secret about his new confidant.