The Devil in the White City

I'm so confused by this book. When I picked this one up I thought I was getting a story about H.H Holms and his murderous rampage... I also expected it to have information about the world's fair but only as it pertained to Holms' story. What I got instead was a book 70% about the conception, making, and opening of the Chicago World's Fair and 30% about a psychopath's twisted day to day life. And they intersected in the most minimal way. Honestly, I felt like I got way more action and suspense from the World's Fair than by any of the horror Holms committed. The only real connection between the two parts of the book is that it created an atmosphere where missing people were not looked into too carefully and gave Holms an influx in victim choices. But like... that's it.
The reason I'm torn is because I reeeeally like the parts about the fair! They were fascinating, intriguing, and suspenseful. But it's not what I thought I was signing up for. The parts about Holms were not very in-depth. In fact, I didn't find them all that interesting. And I guess it's because we don't know a whole lot of what really happened during that time.
I wish the two aspects had been turned into their own books. The World's fair portion gets a 5/5 from me. The H.H. Holms parts gets a 2/5.