Chilling History of IL's Cave-In-Rock & 1st Serial Killers in US
Discover the chilling tale of the Harpe Brothers, America's first serial killers, and their hideout in Cave-In-Rock, Illinois.
Harpe Brothers
Cave-in-Rock IL the Hideout For America's First Serial Killers
Their murders were violent and numerous and seemingly without motive. Take a look inside the infamous Harpe Brothers' Illinois hideout.