First of all, a great film! Beautiful plot and amazing acting from majority of the cast. The haunting background music and crisp editing wastes no time in establishing tension in the viewer's mind. However, the only underwhelming aspect of the movie, according to me, is the way the killer is portrayed. I was not at all afraid of the psychotic killer. He was not cold as most serial killers are. Since this movie is considered a psychological thriller, I think more impetus could have been given to bring light on the psychology of the villain. Enjoy the movie!