Alice and Tally have ruled St. Cecilia's, their private boarding school just outside of London, for years. As everyone returns for junior year, the girls can't wait to start partying in London and jetting off to Paris and Rome. And as Alice begins to realize that she has more than friendly feelings for Tristan, her longtime best friend, she thinks the excitement of a new crush will make this year the best yet. But when Dylan, the American girl Tristan summered with in the Hamptons, transfers to St. Cecilia's, high expectations dissolve into broken hearts, jealousies, and revenge plots that will change everything.