This is the 6th book in the Naughtiest Girl series and this time Elizabeth and her best friend Joan have stayed at school for the half term holidays where they are camping on school grounds. Joan is a tent monitor who has to keep the other girls in the tent in order and look after one particular girl Teeny who is struggling fitting in. Elizabeth's enemy Arabella is also in the same tent so she is finding keeping her temper quite difficult. Anyway Elizabeth can't work out why Joan is behaving strangely and sets out to find out what is wrong. This book was quite enjoyable as it wasn't set inside the school so it was a little bit different from the rest of the series I have read so far.