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he novel follows twin sisters Pat and Isabel O’Sullivan, who are sent to St Clare’s boarding school. At first, they feel unhappy and homesick because they wanted to attend a different school.
Their initial bad attitude leads them into trouble, but as they spend more time at St Clare’s, they begin to understand the importance of friendship, responsibility, and school spirit. Through various experiences—lessons, pranks, and challenges—they gradually change their behavior and become more mature.