In a society that allows families to have only two children, a group of third-borns tries to save itself and others like them. In the aftermath of a crisis that threatens the safety of all shadow children -- illegal third-borns in a society that allows only two children per family -- Trey's friends expect him to take charge -- a function he doesn't want or think he can do. Trey's new role leads him to travel with Luke Garner's brother, Mark, to Population...