This was a good book and there were many things I liked about it, but I did have a few problems... 
 1. Was it supposed to be a mystery? I really hope not because, although the answer to the "mystery" part was interesting, it was not by any means surprising. I'd pretty much figured it out by the time it was revealed. (view spoiler)[Also, the whole answer to the mystery was revealed around halfway through the book. After that, it lost some of its appeal. (hide spoiler)] 
 2. How the book was written really annoyed me. First, it would completely drift off-topic very often. It also had many run on sentences. And pretty much every sentence at one point in the book started with the word And. I know that this is probably because the book was supposed to be written by Christopher, but it made it very hard for me, as a reader, to enjoy this book. 
 3. The ending. It just felt so abrupt. It wasn't bad, but it really didn't feel satisfying. And not like a good cliff-hanger that kept me thinking about it after I finished the book. This just ended. 
 Overall, this was a good book and I think it did a good job portraying an autistic character. It was certainly an interesting book and is definitely a great read. It's also a pretty quick read, so that was nice. It just wasn't quite a 5-star read in my opinion.