Massie Block is happily ruling her fabulous clique at her exclusive Westchester middle school when LBR (Loser Beyond Repair) Claire Lyons moves into the Block's guesthouse and turns Massie's perfect world upside down.

A bet between ringleader Massie and wannabe Claire tests both their willpowers—and transforms the Octavian Country Day student body. Or at least the most important part: their wardrobes.

When Alicia tries to start a clique of her own, allegiances are tested and Massie launches an all-out war—during their Teen Vogue photo shoot! The Pretty Committee definitely isn't ready for its close-up.