Plot

A cop mistakenly believes that taking out three thugs will end Madurai's crime wave.

Jayaseelan (Vishal) is an undercover encounter specialist who is on a mission to eliminate a gang in Madurai who are extorting money from rich businessmen and later killing them. A senior officer who kills the gang leader Bhavani's brother is killed in front of the public and soon Jayaseelan shoots almost all the members of the gang. But who is the king- pin to the nefarious activities in the city?—Ajith

In Madurai, a gang kidnaps top businessmen in the city and demands a sum of Rs. 2 crores (US$250,000) for their release or the victims will be killed. The dead bodies are placed beneath a bridge. Bhavani and Lal are the main culprits behind the kidnaps. SI Albert cracks the case and encounters the kidnappers involved in the kidnap, but gets publicly killed by Bhavani. Jayaseelan is the new ACP who gets deputed in Madurai and is appointed by the special branch to eliminate Bhavani and his gang in police encounters. He also lives with his father, mother and his brother Selvam. Murugesan is the head constable and a close friend of Jayaseelan.

Meanwhile, Jayaseelan meets Sowmya and falls in love with her. Later, Jayaseelan pretends to hold a meeting with Bhavani and his gang to finalize his commission so he will never interfere in their illegal activities, where he encounters two of Bhavani's men. Bhavani is frightened, knowing that someone has set an eye on him that and he will be the next target. Jayaseelan tracks down Bhavani and kills him. Just before dying, Bhavani challenges Jayaseelan that all of the kidnapping incidents will continue after his death, which leaves Jayaseelan puzzled. It is later revealed that Selvam is actually the mastermind behind all the kidnapping incidents, and is a close friend of Lal. Both are involved in planning the kidnappings and murdering the businessmen, while Bhavani is involved only to execute the plan.

Past: Jayaseelan and Selvam's grandfather Ramasamy is a famous freedom fighter, and is widely respected by the local people. He also serves as a minister for 4 terms and is known for his genuineness and loyalty. However, Ramasamy's son Kumarasamy (Jayaseelan and Selvam's father) is not interested in politics and preferred to stay away from all politics following his father's death. Singarasu, a local politician and Kumarasamy's cousin, decides to bank on Ramasamy's political support for his victory. Singarasu convinces Selvam to support his party, to which Selvam agrees. Singarasu won the election and became an MLA and a minister for 5 years.

Selvam is encouraged by a few party men to contest for the same MLA seat during the next election, but Singarasu is the man behind the plan and wants to defeat Selvam to show his power. Selvam trusts a few friends, but later understands Singarasu's plan and loses the election, as Singarasu provided money to vote for him to the public. This enrages Selvam and decides to earn money and use it for election purposes. He makes his lawyer friend Pankaj Lal earn Singarasu's confidence and collect all the information about his illegal activities, while they are also heavily involved in kidnapping rich businessmen in the city and demanding money.

Present: Selvam knows that Jayaseelan is handling the kidnap case. and closely monitors his moves. Sowmya's father, Lakshmi Narayanan, is kidnapped by Selvam and his men demanding money. Narayanan hands the money to Selvam, who appears with a mask in front of him while collecting the money. The next day, a meeting is arranged between Jayaseelan and Sowmya's family members to discuss their marriage proposal. At that time, Narayanan observes Selvam's mannerisms and doubts that he could be the one who kidnapped him. Selvam understands Narayanan's suspicion and decides to kill him before he could contact Jayaseelan. Narayanan requests Jayaseelan to meet him immediately, but he ends up being killed by Selvam before that ever happened.

Jayaseelan formulates a plan to find the culprit, where he decides to tap the mobile phones of all the leading businessmen in Madurai so that he can get to know if the kidnapper calls any of them demanding money. A special team is set up to find the persons involved in phone tapping. A businessman gets a call demanding money, and Jayaseelan decides to follow the person without anyone's knowledge. While the businessman is about to hand over the money to Selvam and Lal, Jayaseelan interferes. Selvam and Lal escape and are chased by Jayaseelan. Jayaseelan shoots and arrests Lal, but Selvam shoots himself in his upper arm, stages a scene where someone has shot him and ran away. Jayaseelan admits Selvam to the hospital.

Meanwhile, Lal is killed inside the commissioner's office by a hitman employed by Selvam. Jayaseelan and Selvam's father overhears a conversation between Selvam with one of his henchmen on his cell phone and found out that Selvam is the mastermind behind all of the kidnapping incidents. Selvam decides to kill his father. Later, Jayaseelan conducts a secret investigation against Selvam and finds out the truth. He receives evidence that Selvam shot himself based on the number of gunshots heard and also understands that Selvam staged a show that he was shot by the culprit who ran away. Jayaseelan goes to Selvam's hideout and finds a secret room behind where their father is tied to a chair. Jayaseelan saves his father and brings him back home.

Selvam is shocked to know that all of his illegal activities are exposed to his family members. He requests them not to take any action as he will become the next minister after the election. Suddenly, Selvam rushes to kill Jayaseelan and his father. Jayaseelan retaliates and hits Selvam. Finally, their father asks Jayaseelan to kill Selvam, saying that it will be a big embarrassment for their family, especially Ramasamy's image in society if the truth comes out to the public. Jayaseelan agrees and kills Selvam, where he puts his dead body beneath the bridge, where usually the kidnappers place the dead bodies of rich businessmen, staging a scene that Selvam is also killed by the kidnappers demanding money. After this, Jayaseelan encounters Selvam's hitmen frames them as the culprit behind the kidnappings and closes the case.