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5. Holmes was the only one who knew all of the nooks and crannies.

4. The Castle made him a significant amount of money.

hh holmes murder castle
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  • Photo Credit: Wikimedia Commons

3. If he didn’t get you one way, he had a half a dozen other tricks up his sleeve.

2. Every inch of the place was designed to hide his true purpose.

1. The basement was well-equipped, too.