It's Halloween and Witch Dezhilba comes to Earth to steal some of the kids she needs to get older for a potion. As her broom carries her to earth, she makes an emergency landing in front of the McGuffles' house. Immediately the scent of children who are about to dress up for Halloween pours into her nose. With their friends Lola and Luke want to pull "Trick or Treat" around the houses. Dezhilba knocks on the door and is asked into the house by an unsuspecting Paul, who considers the old woman a disguised child.

The baroness has seized Luke's remote-controlled drone. Determined to get it back, Luke and Lola "disappear" with the help of Miss Moon's magic pouch. So they come unseen into the house of the Baroness to look for the toy. But when the baroness suddenly sees objects fly through her house, she says spirits have taken up residence with her. Without further ado, she orders a ghost hunter to hunt Luke and Lola.