The Warren's are forced to perform an exorcism themselves, focusing on Carolyn, who has become possessed by the spirit of the witch and now plans to murder her daughter. Through a test of faith and strength, Carolyn forces the demon out, and returns to the family. The house is cleansed, and it appears that the Warren's have succeeded. .
Due to the account's nature, fear and emotion must be portrayed by the actors in ways that the audience will not disbelieve. The actors/actresses chosen by casting for nearly all characters in the film performeddid marvelously. In a relatively early scene, one of the Perron's young daughters (played by actress Joey King) becomes hysterical after seeing a man behind her bedroom door in the night that said he "wanted [her] family dead ". The screams and tears emitted from the young girl are heart stopping, and show an amazing amount of terror. In an interview, Andrea Perron, a member of the real life Perron family commented on how well each actress captured the young girls personalities in the film. .
Although a few on screen events were embellished or added for theatrical effect, the stories of the Perron family and Ed and Lorraine Warren are based off of real life occurrences. Elaine Warren, who is still living today, and her recently deceased husband Ed spent their lives controversially battling the paranormal with passion. The credibility of the Warrens flourished with their later involvement in the infamous "Amityville " murder case. With the anticipation of the movie's filming, both members of the Perron family and Lorraine Warren handed over their personal documents about the experiences in the Perron house. An overwhelming majority of the events pictured in the movie are true based on the given documents, including perhaps the most terrifying one; the possession of the mother, Carolyn Perron. This credibility can only make the viewing experience that much more terrifying and real for the audiences.
