In Enid Blyton's highly popular school series, Elizabeth Allen is at boarding school. She's tried being the naughtiest pupil there, but now she's got a new challenge...

In book four, there's a new boy in Elizabeth's class. He's sulky and grumpy and he'll do anything to show Elizabeth up. She means to keep her temper, but it's not so easy for someone who was once the naughtiest girl in the school. Then Patrick disappears and the Naughtiest Girl starts to panic. Will she be able to make things right?