In Enid Blyton's bestselling school series Elizabeth Allen is sent away to boarding school and makes up her mind to be the naughtiest pupil there's ever been. Book 4: Here's the Naughtiest Girl There's a new boy in Elizabeth's class, who'll do anything to show her up. It's hard for the naughtiest girl to keep her temper when faced with such a challenge ... Book 5: The Naughtiest Girl Keeps a Secret Elizabeth's efforts to put her naughty days behind her are threatened when John trusts her with a secret. She finds herself in more trouble than ever before. Book 6: The Naughtiest Girl Helps a Friend It's hard to be good at camp with Arabella in the same tent. She's causing all sorts of problems for Elizabeth and her best friend Joan. Book 7: The Naughtiest Girl Saves the Day Elizabeth is a suspect when some plants are vandalised. She isn't to blame - and who would want to get her intro trouble? With help, she vows to get to the bottom of the mystery. Between 1940 and 1952, Enid Blyton wrote four novels about Naughtiest Girl, Elizabeth Allen. Books 5-10 are authorised sequels of the series written by Anne Digby in 1999. Both cover and inside illustrations were created by Kate Hindley in 2014.