Summer Wilson has gone missing, and only Hailee seems to have noticed. Hailee and Summer have always been inseparable: sisters over friends. So when Summer doesn't come to school for the first day of school, Hailee worries. When she didn't show up on day two or week two, Hailee knew something was wrong. Summer won't let her endure tests and bullies alone. Not after the rumors of last year and not with her score on the line. Now Hailee needs her best and only friend more than ever. But Summer's mother refuses to give Hailee a direct answer, and Summer's brother August is even less helpful. As Hailee investigates her friend's disappearance, she discovers that no one seems to remember the last time they saw Summer. How can a teenage girl disappear without anyone noticing?