Matilda accidentally sends a cannonball in Mrs. Bevan’s garden and scrapes the poor Peterkins. Bevan gets mad at the kids and accuses them of having disfigured her beloved garden gnome. The kids try to calm her down and hypnotise her, not meaning to… and Bevan begins to act as she was an actual pirate! Her behaviour first makes the kids laugh… until she kidnaps Max and Alexia, and boards Grandpa’s ship! She is such a great pirate that Nugget joins her crew! Jim and Matilda must get her back to normal and save their friends!