Even though his classmates from first grade on have considered him strange and a loser, Daniel Zinkoff's optimism and exuberance and the support of his loving family do not allow him to feel that way about himself.

Still moping months after being dumped by her Arizona boyfriend Leo, fifteen-year-old Stargirl, a home-schooled free spirit, writes "the world's longest letter" to Leo, describing her new life in Pennsylvania.

Living with her warden father in an apartment above a 1950s prison, Cammie O'Reilly struggles to come to terms with the loss of her mother, who died saving her from harm when she was a baby, and interacts with some of the reformed inmates.