Blue Lily, Lily Blue - Maggie Stiefvater

The third book in the Raven cycle is just as good as the first two. Blue's mother has disappeared, looking for Blue's biological father, and Blue desperately wants to find her. Her friends try to help her. In the end they find more than they imagined and not all of it good. I like that there's always a proper ending in these books, with some closure but also a continuing story arc.