The film Deliver Us from Evil showcases a different plot from the book version , which is instead written by Derrickson and Paul Harris Boardman .
`` Despite being officially based on a 2001 non-fiction book entitled Beware the Night by Ralph Sarchie and Lisa Collier Cool and a marketing campaign highlighting that it was `` '' inspired by actual accounts '' '' , the film actually does not showcase any of the cases recounted in the book and instead features a completely original plot by Derrickson and co-writer Paul Harris Boardman . ''
Deliver Us from Evil -LRB-2014 film-RRB-