The new novel from Jill Wolfson an exciting, fresh voice in middle-grade fictionWhitney has been in so many foster homes that she can give a complete rundown on the most common varieties of foster parents from the look-on-the-bright-side types to those unfortunate examples of pure evil. But one thing she doesn't know much about is trees. This means heading for Foster Home #12 (which is all the way at the top of the map of California, where there looks...