the Royal Society for the Prevention of Cruelty to Children. The Grand High Witch, the all-powerful leader of the world's witches, is attending under the name Eva Ernst. Luke hides inside the ballroom and spies on the witches' meeting. Eva unveils her latest creation: a magic potion to turn all the world's children into mice, which will be used in confectionery products in sweet shops and candy stores to be purchased using money provided by Eva. Bruno, who was given the potion earlier, is brought into the room, turns into a mouse, and flees. Luke is discovered and runs to Helga in their room but finds her resting after having a diabetes-induced dizzy spell. The witches seize Luke in the room and take him back to the ballroom, where he is forced to drink the potion and turned into a mouse before escaping. He finds Bruno and reunites with Helga, who has since recovered. Luke devises a plan to defeat the witches by sneaking into Eva's room to steal a bottle of the potion, then sneaking into the kitchen and puts it into the soup for the special RSPCC party. Luke and Helga try to get Bruno to his parents, but they do not believe her story and are frightened by the mouse. Mr. Jenkins orders the soup, though Helga stops him from consuming it. The Jenkinses finally realize Bruno is a mouse when he speaks up. As the witches enter the banquet, Miss Susan Irvine, Eva's long-suffering and mistreated assistant, quits upon being banned from the celebration. The formula turns all the witches into mice, and the staff and hotel guests join in killing them, unknowingly ridding England of its witches. Amidst the chaos, Helga spots the transformed Eva and traps her under a water jug before helpfully pointing her out to Mr. Stringer, who chops her in two with a meat cleaver. She then returns Bruno to his bewildered parents. Luke and Helga return home to where Eva's trunk full of money and an address book of all witches in the United States is delivered, allowing them to plan an operation to wipe out all the witches in America. That night, Miss Irvine, now a good witch (having reformed after Eva's death), drives to Luke and Helga's house and returns Luke to human form, as well as his pet mice and glasses. She leaves to pay Bruno a