The great thing about this movie is that it is not a true horror film. The director said in the Q&A after the movie that he didn't want his killer to be respected, like Hannibal, who he says "looks like the cool guy in the movie". He says that since he is locked up the whole time the audience can be sure that there will be no more murders and so most of the movie is talking and trying to create closure. The movie is very much a focus on the minds of normal people versus what happens to the make a normal person turn into a serial killer. Alvart did a lot of research for the movie on serial killers, Catholocism (spending months working in a church), and being a father, there is a lot on parent-child relationships. There are so many levels that are covered in this movie and that is why it is so engrossing and watchable. It is a totally intellectual film that makes you think about social issues as well as completely scaring and creeping you out. The ending was so amazing. It is the best thriller I have ever seen and no one would ever think that Alvart was the most skeptical of this script ever being produced.Alvart said this film is the most personal out of the many scripts he proposed to producers.