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H.H. Holmes — America's First Serial Killer

During Chicago's 1893 World's Fair, a charming doctor named H.H. Holmes rented rooms in a building he'd secretly designed to make people disappear — windowless chambers, hidden gas lines, chutes to a basement fitted with acid vats and a kiln.

This episode traces Holmes from a small-town con man to the insurance fraud that finally caught him, the murder of his own associate and three children, and the disputed real body count behind a story that's been exaggerated for over a century.

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