“Devil in the White City” by Erik Larson.
Story of the 1906 Chicago World’s Fair and one of America’s first serial killers. A fascinating true story.
Excellent book.
If you like Devil in the White City you also like his book Thunderstruck. It uses the same technique of tying to different themes to create the whole. It’s got a good gruesome murder and the same attention to history and change in society that Devil in the White City does.
I read that one! I’ve read a couple more of his books. One was another story of simultaneous events in history, the other about the Galveston Hurricane of 1900.