Suja, a noted writer, is married to inspector Chandrasekar and has a young daughter. Her sister, Ilavarasi, is married to the abusive Ravi. Vijay is a journalist for a magazine focused on social justice issues and occasionally works with Suja. He meets the orphaned Maadhavi and two fall in love. Ravi kills Ilavarasi and Chandrasekar arrests him. Ravi's business partner Meenakshisundaram and lawyer Mahendran conspire to twist the evidence. The court doesn't have the evidence to convict Ravi and he's freed. He then kills Suja's daughter in front of her but, again, the justice system fails her as he's set up an alibi. Chandrasekar is heartbroken but still believes in the justice system. Suja has lost all faith on the system and is willing to take the law in her own hands in bid for revenge. Ravi is killed mysteriously but it is ruled a suicide. Chandrasekar and Ravi's associates suspect Suja but have no proof. The once loving couple are pitted against each other as Chandrasekar is determined to do his job and uphold the law. Suja, with the help of Vijay and Maadhavi, wants revenge.