Hilary has one goal for her first year in junior high: to become popular. But her plans are turned upside down when her best friend leaves for the summer and a quirky girl named Kallie moves in next door. Kallie paints constellations on her ceiling, sleeps in a hammock, and enacts fantastical plays in front of cute boys on the beach. Yet despite Kallie’s lack of interest in being “cool,” Hilary and Kallie find themselves becoming friends. That summer friendship, however, is put to the test when school begins, reigniting Hilary's obsession with climbing the social ladder. As Hilary discovers the dark side to popularity, she must decide who she wants to be before she loses everything.