The 1893 World’s Fair in Chicago introduced the world to Shredded Wheat, Pabst Blue Ribbon beer and the Ferris Wheel. At the same time, the Windy City was also home to the nation’s first urban serial killer. Erik Larson’s new book tells the story of the architect who masterminded the fair’s success against staggering obstacles, and of a young doctor who built a hotel to hide his murderous ways.