Coincidentally, I am in the middle of reading a book called "The Devil in the White City" by Erik Larson considered one of the definitive books about this real life serial killer, H.H. Holmes. Loved that I knew the reference when it came up in the show. Made me feel smart - LOL!
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And I said "dangerous" and here you are.
You. It's always you. John Watson, you keep me right.