The author has done a superb job with POV and it never wavers. The mystery and tension begins at page one, and continue until the end. Jack's new friend, Roxy, keeps you wondering, is she what she appears to be? What about Mum and Dad? Jack has always known they're a little strange, but nothing can prepare him for what will come. This may be a book for middle graders, but any adult who enjoys SF will enjoy it. I'm almost 70 and I can't wait for book 2.