Ratsasan is a compelling watch that is innovatively told.Arun who has newly joined the police force, comes across an array of murders probably done by a pshyco. Is it the psycho or someother instinct that triggered the murders?The answer to your spark of excitement hearing the outline will be beautifully sketched out in this full fledged edge of the seat thriller. Vishnu Vishal has come with his career best performance and the role looks tailor fit to him.Amala Paul as the love interest looks convincing though in a minor role.The rest of the cast needs to be appreciated for not going overboard,except Susan George who played hero's egoistic senior officer;it was irritating.The screenplay here is well thought out and sharply written.The film has an innovative reveal to its credit and never packs itself under a commercial framework.The dialouges are short and to the point.Director Ramkumar has efficiently made the writing on to the screen, with the help of the technical side.Ghibran could be easily credited as the new age BGM king, for he deserves no less tag for his work in Ratsasan.The BGM pumps up your heartbeat and adrenaline rush is severe.The sound design is marvellous especially during the second half.P.V.Shankar's cinematography is fantastic.Though the film runs for 152 minutes, it hooks you to the seats with an increase in your pressure as the movie develops.

Overall,with a proper psycho story, top class making and efficient direction, Ratsasan is easily the best murder mystery produced in the country in a decade or so.If you decide to skip this, you are probably going to miss one of the best theatrical experiences.