The Exorcist File (2014)

While filming a haunted asylum in St. Louis, Missouri, documentary filmmakers uncover a secret diary of the infamous 1949 exorcism of a 13 year old boy possessed by the devil that later inspired the book and movie, The Exorcist. Utilizing hi-tech paranormal gadgetry along with a legion of supernatural experts, they search out to capture the scariest entity known to man, the Unholy Ghost.