The studio and filmmakers behind the "Conjuring" franchise are being sued by an author seeking $900 million. The three films in the franchise grossed $886 million at the global box office, and two more films are on the way. You can read the entire filing here.

Gerald Brittle wrote a book in 1980 called "The Demonologist" about Ed and Lorraine Warren, the paranormal investigators whose case files are dramatized in the "Conjuring" movies. Brittle claims he had an exclusive agreement with the Warrens.

Warner Bros. also made a deal with the Warrens, which led to the production of "The Conjuring," "The Conjuring 2," and "Annabelle."

What makes the suit more interesting than your standard Hollywood contract dispute is the movie studio's claim that the "Conjuring" movies weren't based on Brittle's book, and that they are based on "historical facts." Brittle says that can't be possible because he and other skeptics posit that the Warrens' case files about paranormal and supernatural activity are fabricated.