Massie Block is happily ruling her fabulous clique at her exclusive Westchester middle school when LBR (Loser Beyond Repair) Claire Lyons, the new girl, has the nerve to show up at OCD wearing Keds and two-year old GAP overalls. She is clearly not Pretty Committee material, and Massie, Alicia, Dylan and Kirsten have no problem letting everyone know it. Unfortunately Claire's family is staying in the guesthouse on Massie’s family’s huge estate while they look for a new home, and the girls are stuck with each other. Claire's future looks worse than a bad Prada knockoff. But with a little luck and a lot of scheming, Claire might just come up smelling like Chanel Mademoiselle....