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!
Between 1941 and 1946, Enid Blyton wrote six novels set at St Clare's. Books 5, 6 and 9 are authorised sequels of the series written by Pamela Cox and feature storylines set in between the original Blyton novels. These books were published in 2000/2008 and are unillustrated.
The Sixth Form At St Clare's: Book 9
Reading age :
9 to 12 years
Enid Blyton's books have sold over 500 million copies and have been translated into other languages more often than any other children's author.
She wrote over 700 books and about 2,000 short stories, including favourites such as The Famous Five,The Secret Seven, The Magic Faraway Tree, Malory Towers and Noddy.
Born in London in 1897, Enid lived much of her life in Buckinghamshire and adored dogs, gardening and the countryside. She died in 1968 but remains one of the world's best-loved storytellers.