The twins arrive at St. Clare's ready to work and play in the summer term as they enjoyed at Redroofs. Will Bobby change and will Carlotta's secret comes out?

Welcome to Malory Towers, where there's more to life than lessons! Summer at Malory Towers means picnics, swimming and horse-riding. There are also the usual tricks to play and secrets to keep, but no one was expecting a mystery to solve. So when a horse is stolen from the riding school run by old girls Bill and Clarissa, all the third-formers want to help. Who could the culprit be? Between 1946 and 1951, Enid Blyton wrote six novels set at Malory Towers. Books 7-12 are authorised sequels of the series written by Pamela Cox in 2009 and focus on the adventures of Felicity Rivers, Susan Blake, and June Johns. This edition is unillustrated. Malory Towers is now a fantastic television drama, available on BBC iPlayer and on CBBC. * Malory Towers ®, Enid Blyton ® and Enid Blyton's signature are registered trade marks of Hodder & Stoughton Limited. No trade mark or copyrighted material may be reproduced without the express written permission of the trade mark and copyright owner.