A dysfunctional family moves into the infamous Long Island property, where the teenage son falls under the influence of sinister forces, causing him to form an incestuous relationship with his sister and ending in a frenzy of murder. The authorities look on the boy as a cold-blooded killer, but a kindly priest knows he is not responsible and battles to save his soul. Horror prequel, with Burt Young, Jack Magner and James Olson.

A local priest tries to rid 112 Ocean Avenue of unclean spirits, but what he doesn't yet suspect is that teen Sonny Montelli has been possessed, body and soul, by a murderous demon bent on total destruction.