Mark Schall kills his mother-in-law and wounds his father-in-law in the middle of the night, then turns himself in. He claims, however, that he cannot remember the crime itself. His defense team finds evidence that suggests the crimes were committed while Mark was sleep walking. They build their defense around this theory.

Returning to his small hometown of Icara, Maine, a man discovers its horrible secret -- a bizarre, clandestine ritual that led to his mother's early death and his father's insanity.