In 1976, hundreds of American Legion veterans walked into a Philadelphia hotel for a weekend of reunions, war stories, and cheap drinks. Within days, dozens would be dead. No suspect. No pattern. No explanation. Just fear, fever, and the unsettling sense that something in the building was hunting them.

This is the story of Legionnaires’ disease — not the textbook version, but the human one. The air they breathed. The science that failed. And the terrifying truth that the killer wasn’t a person at all.

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