https://en.wikipedia.org/wiki/H._H._Holmes

https://www.crimemuseum.org/crime-library/serial-killers/hh-holmes/

https://casocriminal.org/en/serial-killer/h-h-holmes-the-serial-killer-who-built-a-castle-to-kill-people/

https://www.biography.com/crime-figure/hh-holmes

https://www.history.com/topics/crime/murder-castle

https://en.wikipedia.org/wiki/World%27s_Columbian_Exposition

https://en.wikipedia.org/wiki/Pinkerton_(detective_agency)

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