ENID BLYTON - The Naughtiest Girl Keeps A Secret

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.
 
 
 
In book five, Elizabeth intends never to be naughty again. But when John entrusts her with his secret, the naughtiest girl finds herself in deeper trouble than ever ...