As the small town of Mattoon captured national attention during the reign of the Mad Gasser, the investigation took a turn. Authorities were baffled by the deluge of reports -- and their inability to find any physical evidence other than a soiled rag at a doorstep. As researchers and historians looked back on the events, they became increasingly convinced the was a different culprit behind the panic... and though the story was a gas, they were certain there had never been a real Mad Gasser in the first place. Learn more in the second part of this two part episode.