'Vellore mavattam' story begins with Muthukumar (Nandaa). He is from poor family but studies well and becomes an IPS officer. He is posted to Vellore as ASP.
Muthukumar falls in love with Priya (poorna) and both get married too. The twist occurs when Muthukumar decides to clean Vellore of crime and make it peaceful. This gets him into clash with Gurumurthy (azhagam perumal), the local don with lot of influence and connections.
A series of clashes happen and who emerges successful in the end forms the rest of the story.