Question: What were the last lines of the movie?
Question: Does the ending mean that the policewoman gives up on her hunch?
Question: What type of personality disorder does Mr. Brook have, is compulsive killing part of it, and is it really genetic?
Chosen answer: It sounds like Dissociative Identity Disorder. And I think compulsive killing is something he chooses to do, and not connected to his DID; and from skimming the article, it doesn't appear to be genetic.
Question: What does the ending mean? Does Brooks kill his daughter before she kills again?
Answer: Marshall's line was, "Why do you fight it so hard, Earl?" Earl Brook's was, "God, grant me the serenity to accept the things I cannot change, courage to change the things I can, and wisdom to know the difference. Living one day at a time and enjoying one moment at a time, accepting hardships as the pathway to peace. Taking, as He did, this sinful world as it is and not as I would have it, trusting that He will make all things right if I surrender to His will, that I may be reasonably happy in this life, and supremely happy with Him forever in the next. Amen."