Four immigrants (Pandi, Murugan, Afsal and Kumar) are detained by the local state police, tortured and forced to admit to a crime they have no knowledge of. When all hope seems to be lost, a policeman from their hometown speaks on their behalf at the court hearing, setting them free. The policeman asks for a return favor and the boys oblige, oblivious to the consequences that await them. As they unwittingly bear witness to a political treason, the system seeks to silence them at any cost. But Pandi is determined to be heard.
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Sherley (Sarika) is a model who returns to Chennai after a modeling stint abroad. She received by the modeling agency and is soon drugged and operated upon. Her dead body is soon found.
Dileep (Kamal Haasan) is a photographer working for a newspaper run by Lakshmi Narayanan (Thengai Srinivasan). He is a photographer in a beauty pageant run by a rich industrialist, Oberoi (Shamasundar L. Asrani), which was won by Sharadha, Swapna and Radha (Madhavi, Radha and Swapna). He becomes professionally involved with Radha and Swapna while romantically involved with Sharadha. Soon Swapna’s dead body turns up and he becomes the main suspect in the murder investigation and is on the run from police. As his face is plastered in wanted ads all over the city and police are watching Sharadha’s house, he goes to meet Radha.
Radha, who always considered Dileep as her brother as he was always nice to her, helps him and lets him stay in her apartment. The next morning, when Dileep wakes up and turn on the tap, the water is bloody red and he hears screaming coming from the apartment water tank. He goes to investigate when a group of people are gathered around the tank and is shocked to find Radha’s bloody body inside the tank. Soon people recognize him from the wanted ad and mistakenly think that he murdered Radha. He is once again on the run from police for the murders.
He starts to investigate the murders and deduce that the only thing the two girls had in common, apart from him, was the modeling agency. When he secretively meets up with Sharadha, he finds a small incision on her body. Remembering that the other two girls had the same incision, he questions her. Although she doesn’t remember how she got it, she remembers that she didn’t have one before she left on a photo shoot abroad for the agency. She also finds it strange that she was unconscious for a few hours during the shoot but cannot remember what happened.
They eventually find out that Oberoi, has a nefarious business through his modeling agency. He drugs the models during the photo shoot abroad, operates them and smuggles diamonds into India using their bodies. When the models return to India, they again drug the model and take it out and kill the girl.
Dileep gets captured by Oberoi’s goons but with the help of his editor and his girlfriend, he has already got the truth out. Before Oberoi can kill Dileep, they hear the police siren coming towards him. Oberoi, an obsessive diamond collector, rather than get caught and go to prison, eats his own diamonds and commits suicide.
A storm rages. A young girl is kidnapped. Her mother teams up with the mysterious woman next door to pursue the kidnapper, a journey that tests their limits and exposes shocking secrets from their pasts.
Amavasai (Sathyaraj), homeless but egotistical, gets acquainted to politician Manimaran, then MLA of the Palladam constituency, near Tirupur (Manivannan). Amavasai helps Mani with some petty tasks during election campaign and meetings. Amavasai grows into a well acclaimed helper and first associate for Mani. Meanwhile, Amavasai falls in love with Thayamma (Kasthuri) and one day he gives her some drug making her groggy and then rapes her. Mani instructs Amavasai to stand for MLA election as independent candidate in the upcoming general election with his support as Mani was not given his party ticket. Amavasai wins by a huge margin and becomes the MLA. He forgets his relationship with Thayamma and rejects her pregnancy and child. Thayamma and her parents move out of that village to avoid humiliation. Soon Thayamma gives birth to a boy and dies. Amavasai forgets Mani’s help and forces him in a role under him. He changes his name to Nagaraja Cholan for gaining social status. He marries the only daughter of the rich local landlord, Sivakami (Sujatha) and even cheats him of his palace. Over the years, Amavasai grows into a highly influential and corrupt politician with high criminal affluence. He builds a strong political empire through shortcuts. His ego and pride to remain in power make him kill many. He wins and remains as MLA of Palladam in all the general elections for next 20 years.
Now, Amavasai’s son Thangavel (also Sathyaraj) through Thayamma comes out as a new police constable, who is deputed in Amavasai’s constituency. Thangavel is betrothed to a beautiful +2 studying girl Kuyili. They both fall in love. But during the official wedding engagement, a dispute arises over the people asking about his father’s identity and the wedding is cancelled. He asks his grandparents about his father, but they remain silent. So he accuses his mother to be a slut, and his granddad bashes him and tells all about Ammavasai. Thangavel now comes to know of his real father and about his betrayal of his mother and also his corrupt practices. The state assembly is about to be dissolved prior to general elections. But the ruling party leadership does not wish to give a seat to Amavasai again, as he has minimal chances of winning, due to his corruption, illegal activities as MLA. So he invokes a cruel caste riot in his constituency and pretends to stop it. So he is given the ticket again. Thangavel is posted as riot police head constable to stop riots and to protect Ammavasai. He saves Ammavasai from an assassination attempt. He then goes to Ammavasai’s house and reveals his identity. He challenges his father that he will stop all of his illegal activities. Then Thangavel gets posted as Law and Order Sub-Inspector in the same area. The story further revolves around how Amavasai and Thangavel proceed in their battle and finally who wins the battle.