The film opens with the discovery of a corpse of a teenage girl who was brutally murdered.
Arun Kumar (Vishnu Vishal) is an aspiring filmmaker who wants to make a movie on psychopaths. After being rejected many times and due to pressure from his family, he decides to give up his dreams and become a sub-inspector with the help of his brother-in-law Doss (Ramdoss), a police officer himself. He moves to Chennai to stay with his sister Kokila (Vinodhini Vaidyanathan), Doss, and their daughter Ammu (Abhirami). Ammu gets into trouble when she makes Arun sign like her father in her report card. Her class teacher figures this out and thinks she signed it herself. He meets and befriends Ammu’s teacher Viji (Amala Paul) and her niece Kayal (Baby Monica).
Vivek (Bharath), Aravind (Arun), Eshwar (Arjun Bose) and Shafeek (Padma Kumar) are four angry engineering students who cannot stand the corruption in society. They take the law into their own hands and they form the secretive clique called 4 The People (their dress code is black and everything about them is black) that takes out corrupt officials. They have a website where the public can lodge their complaints. Soon the police are on their track. A young cop (Narain) is in hot pursuit of the gang. In a racy climax the foursome attempt to kill the Minister but fail. Seeing the brutality of the police the students come to the support of the foursome. One of the students kills the minister and is joined by three more students. They escape due to the support of students. The revolution continues.
Parattai Engira Azhagu Sundaram
Pandi And his friends comes across a deaf woman Kadhambari (Nayantara) and Pandi immediately falls in love with her. Kadhambari is the daughter of a sincere police officer Ravikumar (Azhagam Perumal)because his father loves police profession, who is in pursuit of Killivallavan aka Killi (Parthiban), a dreaded gangster and politician who had killed Ravikumar’s wife and had caused Kadhambari to lose her hearing in her childhood. Kadhambari seeks Pandi’s help in finding her father, who has not spoken to her for the past two days, to which he agrees. Pandi soon learns that Ravikumar had been killed by Killi, but hides the matter from Kadhambari as it would make her upset. But Kadhambari learns about her father’s death from Meena Kumari and is determined to revenge his death by going after Killi and killing him. Pandi agrees to help her in her mission, with the promise that he will hold Killi’s shoulders while she stabs him.
The story opens in the British India reign, where a British man and porter are trying to catch a ferry. On the way, however, one of the suitcases being carried by the porter falls and opens, revealing many diamonds. The porter steals some of the diamonds and sends the gentleman on his way. He hides these diamonds in a trunk, which he buries near a temple in the Gulaebaghavali village. The story then shifts to 2018, where Badri (Prabhu Deva) and his boss Nambi (Mansoor Ali Khan) perform petty thefts. While at a pub, Badri spots Viji (Hansika Motwani) and falls for her. Soon, Badri unknowingly accepts to steal a priceless statue from the temple at Gulaebagavali and runs into Viji. The duo escapes from the villagers. With some help from Munish (Ramdoss) and Maasha (Revathi), they steal the trunk, which reveals a skeleton. After a lot of confusion, the trunk is delivered, where it is revealed that the diamonds are stored in the skeleton. The police comes to the spot and finds that the diamonds were very valuable. After they escape from the police, it is revealed that during the fight, a hand of the skeleton fell in Maasha’s car. On finding this out and how Maasha tried to deceive the other three, the trio chases her. A parallel storyline involves Mayilvaganam (Sathyan) and a don Annachi (Rajendran), which culminates in the climax.
Saravanan, a psychiatrist, meets up with his foster brother Senthilnathan alias Senthil, and his wife Ganga while on vacation. Senthil’s mother Kasthuri wanted Senthil to marry Priya, the daughter of his father’s cousin Kandaswamy, to reunite the two branches of the family after 30 years of separation because Senthil’s father chose to marry Kasthuri instead of Kandaswamy’s sister, Akhilandeshwari. Saravanan learns that Senthil had bought the Vettaiyapuram mansion, despite attempts by the local village elders to dissuade them, and moves in with them. Akhilandeshwari is jealous of Saravanan and plots to kill him with the help of her assistant Oomaiyan.
When the family visits their ancestral temple, the chief priest reveals the reason everyone fears the mansion. A hundred-and-fifty years ago, a king named Vettaiyan travelled to Vijayanagaram in Andhra Pradesh, where he met and fell in love with a dancer named Chandramukhi. However, she did not reciprocate his feelings as she was already in love with a dancer named Gunashekaran. As a result, Vettaiyan took her back to his palace by force. Unknown to him, Chandramukhi made Gunashekaran stay in a house nearby and had meetings with him secretly. When Vettaiyan discovered this, he beheaded Gunashekaran on Durgashtami and burnt Chandramukhi alive. As a result, Chandramukhi’s ghost tried to take revenge on Vettaiyan, who with the help of various priests and sorcerers from all over the country, tames the ghost by locking it up in a room located in the palace’s south-west corner. Priya is in love with Vishwanathan, a dance professor who reciprocates her feelings. Their love is supported by Saravanan, who requests Kandaswamy to arrange their marriage.
After a heist job by Madhan and gang to rob precious cargo becomes a mess, he is under pressure to deliver the loot to his overlords. Things begin to get complicated when Kathir appears and finally reveals what really happened tha…