In July 1951, a quiet neighborhood in St. Petersburg, Florida, was rocked by an unexplainable horror.  Mary Reeser, a 67 year-old widow, was found reduced to ash in her favorite armchair-her body almost completely incinerated, yet the room around her was barely touched.  The only thing more unsettling than the scene itself was the theory floated by investigators: Spontaneous Human Combustion.