While other kids are out trick-or-treating, eighth-grade magician Harry Moon is flying on a magic cloak named Impenetrable. Harry and Rabbit speed past severed hands, boiling cauldrons, and graveyard witching rituals on their way to unravel a decade-old curse at the annual Sleepy Hollow Halloween Bonfire. With "do no evil" his motto, Harry goes to battle with the sinister Mayor Kligore and Oink, a demon dog. Halloween night becomes the fight and nightmare of Harry Moon's young life.