| Director | M. Raja, Mohan Raja |
|---|---|
| Budget | ₹15 crore |
| Box office | ₹100 crore |
In 1975, a low-level party cadre, Sengalvarayan, is dedicated to his cunning regional leader, Tamizhvanan, and his party to the extent that he is working for a party meeting when his wife goes into labor. Tamizhvanan accidentally comes to the area of Sengalvarayan's house and lends his car to take Sengalvarayan's wife to the labour ward, but the delivery happens safely inside the car.
In 1990, Sengalvarayan's son, Pazhani, secures the first rank in his 10th standard state exam and visits Tamizhvanan, now the chairman of the party and a member of the ruling coalition, for his blessings with his father. While they are waiting in the party office for the leader to come in, they witness an accidental murder of a rebel in the party by Tamizhvanan due to caste-related comments by the rebel on him. When Tamizhvanan asks Sengalvarayan to take the blame by saying that he killed the man due to rage about the rebel's comments, Pazhani volunteers to take the blame and is willing to go to prison, citing the leniency of juvenile laws in exchange for an MLA seat for his father in the upcoming by-elections. Tamizhvanan accepts, and Sengalvarayan later becomes an MLA.
In 2015, trainee IPS officers Mithran, Shakthi, Suraj, Kathiresan, and Janardhan discreetly assisted the police in catching a gang that kidnapped four girls. One day, Mithran receives a cryptic text message on his phone from an anonymous number stating that they are aware of their discreet activities. In the evening, they go out to meet that person, who is revealed to be Mahima, a forensic pathologist and Mithran's ex-girlfriend. Later that same night, they happened to witness the murder of a social activist named Raman, with the pretence of snatch theft. Mithran and his friend catch the gang and their leader and hand them over to the police. Four days later, the gang leader comes to the IPS headquarters with the Home Minister.
This political and organised crime comes as a shock to Mithran and his friends. Mithran takes them to his house and shows his research on connecting all small, unrelated incidents into the global view of a hidden crime network who bend the law for their own financial benefits. He singles out three influential people: pharmaceutical mogul Ashok Pandian, mineral magnate Charles Chelladurai, and chieftain Perumal Swamy. When he tries following one, he realizes that all three of them work as a group, and they all work for a wealthy and influential scientist, Siddharth Abhimanyu. After the completion of his training, Mithran is awarded medals for specializing in dealing with organized crime during training and also for being the best probationer of the batch, and is posted as the ASP of the Organized Crime Unit.
Mithran discovers that Siddharth is Sengalvarayan's son, Pazhani. After his release from prison, Pazhani had his name changed and left India to complete his education abroad. After his graduation, he returned to India and is now a well-established scientist. Siddharth uses the medical field for the wrong reasons and his own profit. Sengalvarayan is now the incumbent Health Minister in the minority government headed by Tamizhvanan, who is now the CM. At that time, Angelina, a Swiss pharmaceutical company owner and activist, tried to make generic medicines for life-threatening diseases available in India at a low cost affordable by poor people. Siddharth's assassin kills Angelina before she can sign the agreement document with the government and shoots Mithran at the same time, and the assassin is eventually killed by Vicky, another assassin of Siddharth.
While Mithran is recovering from the gunshot wound in the hospital, an electronic bug (GPS + audio transmitter) is implanted during another surgery by Siddharth. Through the bug, Siddharth listens to all of Mithran's plans and continuously monitors his whereabouts and conversations via audio transmission. Then comes evidence against Siddharth in the form of Manimekalai. Manimekalai was a scientist at Siddharth's research lab, where a seaweed that can cure diabetes is found abundantly in the oceans. Siddharth tries to sell the technology and rights to extract medicine from the seaweed to multinational pharmaceutical companies, but is opposed by Manimekalai, so Siddharth hires goons who kill her. Before being killed, Manimekalai records a video and stores it on an SD card so that someone will find it.
Before Mithran can find the card, Siddharth notices this and assigns Vicky, Perumal Swamy's brother, to recover the card, but Mithran tells Jana to retrieve the card. He successfully gets the card after a fight with Vicky, but Siddharth hears through the bug, abducts Jana, beats him up, and kills Jana with the help of Vicky after drugging him, with Mithran being unable to save his friend. Mithran comes back to his special house, where he finds a pin that has been changed in a picture, which turns out to be the picture of Ananya, who was Miss World 2011 and a close acquaintance of Siddharth, whose girlfriend Shilpa was also part of that event. Mithran doubts whether Siddharth himself would have come to his house. Mahima checks the fingerprints on the pin keeping the gun case Mithran received from Siddharth in his posting ceremony, and the fingerprints match. A flashback reveals that Siddharth had Shilpa's father killed through Perumal so that she would not participate in the competition, and as she will not have a ticket to attend her father's funeral, he offers to take her on his chartered flight and wins her over.
Mithran frantically searches for the bug, which he eventually finds and removes. Mithran captures Vicky and records all the information from him. He drugs Vicky with the help of his friends and manipulates Siddharth into killing him. At the same time, Siddharth's father reads the changed medical report, which contains excellent medical contracts for public welfare and multiple accusations against Tamizhvanan.