I've mentioned this book before in discussing how this was a perfect example of the inventiveness that is often found in young adult literature. It also has the best cliffhanger. This is quite possibly because I was unaware that this was part of a series while I was reading it...despite how it says BOOK ONE right on the cover. Unfortunately, the book's follow-up, The Ask and the Answer, wasn't fulfilling. But the first installment's ending is jawdropping for sure.