Kutrapathrikai story revolves around the assassination of former Prime Minister Rajiv Gandhi. Rajiv Gandhi comes to Sriperumbudhur as part of his election campaign. Security is on high alert. On duty at the spot are Assistant Commissioner of Police, Ramakrishnana(Ramki) and Arun (Rehman).
Insipte of the high security, suicide bomber Dhanu enters the place, goes near the leader and detonates the bomb in her vest. 13 policemen on duty at the spot die in the incident and Arun gets suspension order.