Over the course of their 50-year career, Ed and Lorraine Warren investigate thousands of hauntings. Some of their most famous cases include the Amityville Horror house and the real-life Rhode Island home behind "The Conjuring" films.

The Exorcist has terrified audiences since 1973, but few know the story is true. For the first time on television, investigators expose shocking secrets about the real-life exorcism of a 13-year-old boy that inspired an iconic horror film.