Schooldays at St Clare's are never dull for twins Pat and Isabel O'Sullivan in Enid Blyton's much-loved boarding school series.

In book nine the unimaginable has happened - the twins made head girl! It's a tough job - cheeky first formers and cruel Priscilla keep the girls on their toes.

It's the twins last year and there definitely will be mischief!

(P) 2017 Hodder Children's Books