Twelve-year-olds Andy and Marnie think they've won big when they get a free souvenir from Horrorland's gift shop. They're not worried when the shopkeeper says they'll have to "pay later". Or that the hound's tooth is said to be haunted. A tooth that grants wishes is worth the risk. But when Andy hears howling at night and Marnie starts acting strange, they begin to rethink the gift from Horrorland.