Karthik is an upright RAW agent who is on the trail of an anti-national group who are out to destabilise the country. He lives in a palatial house with his mother in New Delhi. The police in Chennai nab Ali, a terrorist behind the Parliament and temple attack. Sudha and Shiva are the children of Manikkavel IPS, IG-Prisons, police officer who is in charge of bringing Ali to court.

Now Ali's people kidnap Sudha and blackmail her brother to bring home three terrorists and give them shelter. So he is forced to introduce them as his friends and keep them in his father's official bungalow.

Karthik saves Sudha from the terrorist and comes to Chennai to uncover the ISI plan to rescue Ali and create communal tension in the state. How Karthik emerges winner single-handedly forms the rest of this predictable yarn.