Thamassu is a journey from violence to humanism. Shankar (Shivaraj Kumar) is a police officer and Shanthi (Padmapriya) is a doctor. They both will marry but soon realize that their ways of thinking is different. Over the course of their confrontations, Shankar begins to question himself and realizes that like terrorists, he also believes in violence. Later how he change himself forms the story.It is a story each one of us goes through. How much of what we think as right, really right? How much of what we do as our duty, really service? Agni Sridhar weaves the story marvellously, touching upon issues of state sponsored religious riots, terrorism and the purity of human relationships which goes beyond all boundaries.