Schooldays at St Clare's are never dull for twins Pat and Isabel O'Sullivan in Enid Blyton's much-loved boarding school series. Claudine at St Clare's Eileen's mother is the new Matron and Mam'zelle's niece, Claudine, joins St Clare's and causes havoc wherever she goes. The twins are enchanted by rebellious Claudine and her mad-cap plans, but will she last the term? Fifth Formers of St Clare's The girls are in the fifth form, about to reach the sixth, but they are not too old for tricks and escapades, jokes and excitement. Especially amusing is French girl Antoinette who, like her sister Claudine, doesn't always understand the ways of St. Clare's. The Sixth Form at St Clare's 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. There'll be mischief at St Clare's! 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 2/28 and are unillustrated.