The new girl Darrell Rivers has to make new friends, play pranks, and have fun at Malory Towers, in Enid Blyton's most beloved boarding school series. In the third book, there are many new students, including the elegant Zerelda from America. This year, the challenges are not just for the girls - Bill's poor horse, Thunder, is suffering from colic. Will Zerelda and Darrell become friends, and will Thunder survive? There's more action at Malory Towers! Between 1946 and 1951, Enid Blyton wrote six novels set at Malory Towers. This edition contains the original text and has no illustrations.