I'm conflicted on what to give this book. While I think it might be a good book for younger kids, I don't see a cross over with people over the age of maybe 9 or 10. 
 The characters are all really one sided and really have no depth to them. I could almost predict what they were going to do. 
 The plot is so out there, 2 kids traveling around the world with an 18 year old babysitter? While I know books don't have to be believable this is so out there that it's hard to grasp. 
 The other problem I have is this whole play online see what you think of the clues. Why can't I just read a book why do I have to go online? 
 Other then that the history and mystery were good lead in and I think if they had just left this a book instead of tying in games and such it would have been better and more interesting.