Just watched it and it is a masterpiece, hard to find a fault in it. Grips you from the start and takes you for a ride. I only wish I could see a version WITHOUT the music. It works yes, in the traditional sense of adding to the suspence and the momentum but the movie doesn't need more of that. it felt external and distracting from the intimacy of the experience. What a beautiful movie. And as far as understanding the roots of this behaviour it could be the only serial killer movie one needs to see.