Holly and Marina make a childhood pact - to be forever friends. As the years pass, Holly seems to be the only constant in Marina's life. Holly buries herself in books, insecure around her beautiful and possessive best friend. She holds one secret from Marina: her increasing passion for Marina's brother, Nat. As the years roll by, the girls try everything life has to offer - sex, love, loss, and rock 'n' roll. But for Holly, a friendship that has never been equal gradually begins to feel like a trap.