Jim, Matilda and their friends can’t stand Mrs. Bevan’s rules any longer. But the kids discover that she is hiding a shameful secret… Jim doesn’t think twice: he uses it against her, and threatens to expose her, unless… she leaves them in peace. And it works! It works so well that Mrs. Bevan wants to leave Dull-on-Sea forever! Uh-oh, that wasn’t the plan. Especially as, without Bevan, Jim feels a bit lame… There’s not much point being a pirate without an enemy! The children realize they have gone too far with the blackmail… They must find Bevan and bring her back! Even if that means they have to put up with her rules again…