I wish I had read this about 2 months ago. I would have used the free time on my week-and-a-half business trip to Chicago a lot differently.
Both parts of this book had me completely captivated (the two main threads alternated throughout the book). I found the sections on the history of the World's Fair in Chicago fascinating. I had no idea so many things had originated from this moment in the history of our country, and still can't believe that such an enormous undertaking was completed in such a short period of time. The sections on the serial killer H.H. Holmes were just as interesting, albeit in a different way. It was true crime on par with Ann Rule, and a window into the mental workings of a murderous psychopath.
I found this book to be a thrilling read and extremely difficult to put down.