Parapsychologist Sam Towne believes that ghosts come from the human mind, not from "beyond". To prove his theory, he invites eight volunteers, including skeptical reporter Joanna Cross, to take part in an experiment. In a series of seances they invent "Adam Wyatt," a tragic Revolutionary War hero, and are thrilled when he starts rapping on tables and spelling out messages.

But when members of the group begin dying in horrifying ways, it becomes clear that Adam has taken on a strange and dangerous life of his own -- one feeding on their very thoughts and emotions. Now Sam and Joanna must destroy Adam before he destroys everything in their world -- and even the love they have found for each other turns into an endless, terrifying, inescapable nightmare...