Welcome to Chestnut Hill, a prestigious boarding school with a rich tradition of academics, horses, and rivalry. This year, five girls from different backgrounds will challenge the Chestnut Hill stereotype. There's witty, spunky Dylan; secretive Malory; western tomboy Lani; Honey, the soft-spoken Brit; and polished New Yorker Razina. None is prepared for the social or riding rigors, and they all doubt they will fit in -- certainly not if queen bee Lynsey and her clique have any say. But if this unlikely fivesome can band together, they may prove themselves the true stars of Chestnut Hill.