I read a review on here before beginning this book that stated that while it was a good book, it felt like two separate books combined into one. I couldn't agree more. The world's fair chapters were interesting yet read much more like a nonfiction book, with so many names, dates, and places thrown at you that it makes enjoying it as a narrative hard at times. The Holmes chapters were interesting and easy to get absorbed into. Very different reads however. I am interested to see where the movie is going to go.