Mannu, an ambitious yet carefree guy who wants to stay away from this violence, gets entangled in the lives of gangsters as Durai, whom his brother Dhana wanted to protect, dies.
An upright city-bred IPS officer investigates a mysterious case of three missing Dalit girls in a rural part of Tamil Nadu. While two are found dead, one is missing without any trace. Can he crack the case and get hold of the culprits?
ASP Walter IPS, who plays the titular role as a cop, gets the mandatory, yet routine hero introduction scene when a protest turns violent in Kumbakonam. Later, he takes up the case of a couple who seeks his help to find their newborn baby. Walter suspects foul play when he comes across similar cases, and sets out to investigate the crimes, accompanied by his subordinate Paneerselvam. Meanwhile, the ego clash between Eshwaramoorthi, a leading politician in the town, and Bala, who is considered to be his successor, intensifies. Their ego clash brings Balu's friend Arjun, who is linked to the kids who have gone missing, into the picture. How Walter faces several odds in his attempt to nab a criminal syndicate forms the rest of the story.