School days at St. Clare's are never boring for the twin sisters Pat and Isabel O'Sullivan in Enid Blyton's beloved series. In the seventh book, Eileen's mother is the new headmistress and her niece, Claudine, joins St. Clare's and causes a stir wherever she goes. The twins are enchanted by the rebellious Claudine and her crazy plans, but will she manage to stay until the end of the year? More pranks are expected at St. Clare's!

Between 1941 and 1946, Enid Blyton wrote six novels set at St. Clare's. This edition features the original text and is without illustrations.