Ratsasan is one of the few tamil cinemas that can give you goosebumbps for the thriller nature and if you start watching the movie you will be glued towards the screen to know what's going to happen next due to characterization of the mystery killer and the backstories and coming to the movie the vishnu vishal acting is excellent and this film is made for him. finally special thanks to ghibran for the amazing background music that can haunt inside your head for several days and apart fromt that the only negative i find in the movie is what ever murders that happens in city is mysteriously have an connection with the hero and his family and finnaly i recommend all to watch this rare kind of tamil film that comes once in an while