'Conjuring 3' in works, David Leslie Johnson to write script

New Line has started working on "The Conjuring 3" with David Leslie Johnson attached to write the script.
James Wan will serve as producer through his Atomic Monster production company with Peter Safran, reported Variety.
As with the first two "Conjuring" films, which starred Patrick Wilson and Vera Farmiga as paranormal researchers Lorraine and Ed Warren, the story will be taken from the Warrens' case files.
Johnson also wrote "The Conjuring 2," which went on to gross USD 320 million worldwide.