Police officers Adhi Narayanan and Abbas devise a masterful plan to bring a terrorist group in control, and send two secret vigilance officers – Anand and Shiva – on "Operation Dhanush". The objective is to infiltrate a terrorist group headed by a Naxalite named Badri, and relay information back to Abbas. After a year while relaying information to Abbas, Anand gets caught, but he commits suicide before the terrorists can interrogate him. With information relayed by Anand, Abbas and Adhi know that the terrorists are picking up someone important and going to Trichy.