One of Kessler's ten favorite books involving a turning point for a teen, as shared at the Guardian:
Apple and Rain by Sarah CrossanRead about another book on the list.
Sometimes a turning point is a moment when a character knows what they have to do. Sometimes it is about outside events forcing decisions on them. In Sarah Crossan’s beautiful Apple and Rain, it is about main character Apple finding that the fantasy life she has imagined she will have when her long lost mum comes back for her is not matched by the reality. When her mum finally does come back, she has brought something (or someone) with her that makes Apple question everything she’s ever believed, and forces her to reassess her new life completely.