Here are the incredible true stories of some of the mortals who achieved notoriety in history and folklore through horrible means. Monsters of this sort - serial killers, desperate criminals, and socially mobile people with a much darker double-life - are, in fact, quite real . . . including H. H. Holmes, the infamous Chicago serial killer; William Brodie, the Edinburgh criminal mastermind who inspired The Strange Case of Dr. Jekyll and Mr. Hyde; and Bela Kiss, a Hungarian tinsmith with a most disturbing hobby: collecting women in gasoline drums.

As Aaron Mahnke reminds us, sometimes the truth is even scarier than the lore.