Newcomers Patricia and Isabel O'Sullivan are identical twins, but their personalities couldn't be more different. Isabel is quiet and reserved, while Patricia is lively and mischievous. At St. Clare's, they quickly become the centre of attention, though not always for the right reasons. Their first term is filled with typical schoolgirl drama: they meet a quirky group of girls, navigate difficult teachers, and get involved in some cheeky schemes. However, as the term progresses, the twins' bond is tested by a misunderstanding that threatens to tear them apart. Will the twins stay united, or will St. Clare's become their undoing?