In Enid Blyton's best-selling 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 three, Elizabeth Allen is delighted to be chosen to be a school monitor. But she soon finds out just what a responsible job it is. The harder she tries, the worse she behaves! Will the naughtiest girl in the school ever learn to be good?