Jolly hockey sticks! It's the twins' first year at St Clare's - that means three terms of adventures in the same volume for the first time! The Twins at St Clare's: Pat and Isabel O'Sullivan plan to give everyone at their new school a few surprises. But it's them who are in for a shock . . .The O'Sullivan Twins: Pat and Isabel are determined to work hard this term. But it's just so tempting to play a few tricks on Mam'zelle . . .Summer Term at St Clare's: New girl Carlotta has a secret past! What will happen when sneaky Prudence tells the rest of the class?