It is a story of gang wars and how a newly emerged don robs the other existing gangs and gets the ultimate power among all. But eventually it turns out that he has been working in cahoot with the police forces and this was all their plan to track down all the underworld activities and trading.
Vetrimaaran IPS is a young and dedicated cop posted as the Assistant Commissioner of Police in Chennai, where he lives with his parents and his brother. A seemingly innocuous case of a missing woman he is assigned to, evolves to become a double murder case. Though the investigation leads him to meet his soulmate, the case gets murkier by the day. The situation get out of hand when his own family gets embroiled in the mix and he is pushed against time to decode the mystery.
The film starts with a flashback. ACP Bose (Karthik) is a sincere police officer happily married. He lives with his parents and younger brother Velu (Arun Vijay). Velu is a college student, and he falls in love with his classmate Anjali (Dhansika). Enters Umapathi (Chandrasekar), the villain who is notorious for settlements and land deals. Anjali comes across Bose when she is on a field trip from her college with her friends. She gets friendly with his daughter Pinky, who tells her that she would get her introduced to her uncle Velu, and they would make a good pair. It turns out that Velu studies in Anjali’s college and soon after, they come to know each other and get close.
Bose investigate the case of Umapathi, whom no one has been able to touch. He is even involved with a land deal involving crores of money which is completely illegal and others including the DIG is involved. When the chairman of the bank who has lent money for the deal demands the money back as the deal has not worked, Umapathi eliminates him.