This middle school age book was fun. I received it for free and voluntarily chose to review it. While it was fun with a lot of action, the characters lacked any real depth. I would have liked to see a little more. While it was centered on recycling and saving the world, I would have liked to have answers as to why. I would hope that this would make some of our teenagers think about it more. Because it was a little fun and a good subject matter, I've given this a 4* rating and I'll be sharing this with my grandchildren.