Sethupathi (Vijay Sethupathi) is an honest police inspector from Madurai who is awaiting his promotion to Assistant Commissioner of Police (India). He takes up a case involving the murder of a Sub-Inspector Subburaj, who was hacked to death by some thugs while on duty but was not the target. The actual target was another Sub-Inspector Kanagavel, who works in the police station where Sethupathi is the inspector. Kanagavel was off-duty on the day he was supposed to be murdered, and Subburaj, who is attached to another police station, was filling in for him. Sethupathi finds out that an influential Boss (crime) and politician Vaathiyar (Vela Ramamoorthy) is behind the murder. Kanagavel is married to Vaathiyar's daughter, but it is an unhappy marriage. Therefore, Vaathiyar had decided to kill Kanagavel. Sethupathi arrests Vaathiyar during a temple festival and forces him to travel to Chennai to apply for bail, earning his enmity.