Lifelong best friends Nina Bermudez, Avery Dekker, and Melanie Forrest face their first separation the summer before their senior year when Nina attends a ten-week summer program at Stanford. Nina returns home bursting with stories about Steve, her summer romance. But she soon learns the shocking truth about what her friends were up to while she was gone when she sees Mel and Avery . . . kissing. The friendship is rocked by what feels like the ultimate challenge. But it's only the beginning of a sometimes painful, sometimes funny, always gripping journey as three girls discover who they are and what they really want.