Kirsten and Walk, seventh-graders at an elite private school, alternate telling how race, wealth, weight, and other issues shape their relationships as they and other misfits stand up to a mean but influential classmate, even as they are uncovering a long-kept secret about themselves.

Middle schooler Liberty likes to make her own maps of the stars, in fact she is obsessed with them, especially since her family is falling apart; her parents are getting divorced, her nine-year-old sister will barely leave the house and carries a stuffed tiger at all times, her father is suffering from depression, but will not talk about it, and the brothers down the street, once friends, have turned into bullies--so when a tiny meteorite literally...