In September 1944, while Allied troops battled overseas, the quiet Illinois town of Mattoon was seized by panic. Families awoke to a sickly-sweet odor, burning throats, and sudden paralysis, then glimpsed a shadowy figure slipping into the darkness. For two breathless weeks, newspaper headlines screamed of an "Anesthetic Prowler," armed neighbors patrolled the streets, and the FBI weighed sabotage or chemical crime. Yet in the end, no culprit and no clear cause were ever found. Was it an industrial leak, a wartime spy, a malicious prankster, or mass hysteria born of home-front stress? This episode unpacks one of America's strangest unsolved mysteries and asks what happens when fear itself becomes contagious.

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