Dani is being a "Halloween humbug" and refuses to take little brother Max and his friend, Ben, trick-or-treating. The two boys plot their revenge, roping in Toby and Sam to help trick Dani into becoming a Halloween believer, by pretending the house is haunted. A frightened Dani hires a ghost hunter to banish the ghouls but, when she realises she has been tricked, she turns the tables and spooks the others. The whole gang gets the shivers when they find out there is actually a ghost in the house.