The Devil in the White City by Erik Larson (2018, True Crime)
"This is a book I normally wouldn't have picked up, which is one thing I love about this reading challenge. It not only talked about the crime (it's about HH Holmes), but gave details about the building of the Chicago World's Fair, which I found fascinating." — Patricia
Here they are, for reference: 2015, 2016, 2017, 2018.