Elizabeth is furious when a girl new to the sixth form becomes head girl over the obvious choice her friend Emma. The new head girl Kerry is a young actress and Elizabeth is convinced that all the seniors have been swayed by her acting skills both on screen and at school. She knows the real Kerry is a nasty piece of work - but how can she prove it? Shes determined to try and starts a campaign to replace Kerry with Emma. But Kerry is cleverer than Elizabeth thinks and somehow she just manages to make the Naughtiest Girl look like a troublemaker!