Goodbye Time — Celeste Conway

AS LONG AS she can remember, Anna has lived in the same Upper West Side apartment with her parents and brother, Tom; she's attended the same private school and had the same best friend, Katie. Katie has always loved hanging out with Anna's family and escaping the tension in her own small apartment, where her single mom struggles to raise her severely mentally challenged brother.

But then something changes. Katie's brother gets violent with her mother and now he's going to live in a home. Suddenly Katie is angry with Anna, and just as quickly they're not friends anymore. Anna's mom tells her that Katie just needs someone to be mad at right now, and that everything will be okay, but Anna knows that she has entered the Goodbye Time -- and things are changing faster than she can understand.