In "The Devil in the White City," Erik Larson details the chilling activities of H.H. Holmes during the 1893 World's Fair. Holmes promoted his establishment as a welcoming hotel for fair visitors, creating an enticing atmosphere for guests. However, the reality was sinister, as numerous individuals went missing after staying at his Castle, leaving authorities baffled by the sudden disappearances.

Franke highlights that at least fifty people who vanished were last seen at Holmes's hotel, marking it as a focal point of intrigue and tragedy. Although the exact number of fairgoers lured to the Castle remains uncertain, it is evident that Holmes frequently filled the hotel to capacity, suggesting a disturbing pattern of deceit and crime during this iconic event in American history.