The film Deliver Us from Evil showcases a different plot from the book version , which is instead written by Derrickson and Paul Harris Boardman .
`` The movie is officially based on a 2001 non-fiction book entitled Beware the Night by Ralph Sarchie and Lisa Collier Cool , and its marketing campaign highlighted that it was `` '' inspired by actual accounts '' '' . ''
Deliver Us from Evil -LRB-2014 film-RRB-