In May 1975, 45-year-old Frank Hilley began experiencing severe nausea, vomiting and stomach cramps in his home in Anniston, Alabama. He died just over a week later. Soon after, his wife Marie Hilley began to receive threatening phone calls, messages and damage to her property. When her teenage Carol Hilley began to show the same symptoms as her late father, Marie flew into a panic trying to get to the bottom of what was happening.