Twelve-year-old Massie Block is the leader of the Pretty Committee, a clique of popular, wealthy students at her upstate New York all-girls private school, Octavian County Day. Much to Massie's chagrin, the Block family begins hosting the Lyons family, old friends of Massie's father who have recently moved from Florida and have a daughter Massie's age, Claire. Massie is immediately dismayed by Claire’s off-brand clothes and social awkwardness, and orders the other members of her clique - Alicia Rivera, Dylan Marvil, and Kristen Gregory - to join her in bullying and excluding Claire
