Welcome to Chestnut Hill, a prestigious boarding school with a rich tradition of riding and rivalry. This year, four girls from different backgrounds will challenge the Chestnut Hill stereotype. There's feisty Dylan; secretive Malory; tomboy Lani; and Honey, the soft-spoken Brit. All are nervous about life as 'new girls' - especially when queen bee Lynsey and her clique set out to make life difficult. But if this unlikely fivesome can band together, they may prove themselves the true stars of Chestnut Hill.