Summit Entertainment has hired writer Barbara Marshall to adapt Mark Opsasnick's book called The Real Story Behind the Exorcist: A Study of the Haunted Boy and Other True-Life Horror Legends from Around the Nation's Capital for the big screen.

Plot details are being held under wraps, but we do know that the film will be titled Exorcism Diaries. Roy Lee, Sonny Mallhi and Doug Davison will be producing.

Barbara Marshall is best known for writing a handful of episodes for Terra Nova and made the 2012 Black List for Peste.

No production schedule has been released.