This can be called a perfect psycho crime thriller. It's not a horror movie but will terrify you. The antagonist and his brutal crimes are spine chilling. This antagonist is way more terrifying than antagonist of horror movies. If you're watching for first time,I bet you can't stop thinking about it for post 2-3days. Saravanan nailed as Christopher (the psychopath). Vishnu Vishal, Amala Paul,Munishkanth,Abhirami & all others did really well. Hats off to Ram Kumar, writer/director of this masterpiece. Will must say Ghibran's musical is icing on the cake. The movie wouldn't have this effect except the brilliant background sounds. It's been 3 years since the movie released,but never fails to amaze. This movie set a benchmark in psychological/crime thriller genre of Indian cinema. I absolutely loved it & have watched more than 5 times;but always it gives that much thrill. Highly recommended.