St Clare's is a boarding-school for girls. The books follow the exploits of Patricia ("Pat") and Isabel O'Sullivan from their first form upwards. The series is full of the adventures the girls go through in St Clares, as they try their tricks and jokes, their midnight feasts, fun and friendship. Fun apart, school also means hard work, exams, problems, hot tempers, malice and snobbery. Certainly there's never a dull moment at St. Clare's!