There was very little suspense buildup throughout the book. I never felt super-compelled to keep reading in order to find out the answer to the mystery, and reading of the synopsis of this book, that's what I had expected. I also disliked that the whole book mentioned the Mumbler, but when the reader finally finds out who the Mumbler is, there are maybe 10 pages left in the book. There were also some writing quirks that were awkward.