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.

Manohar (Guru Somasundaram) is a jobless struggling writer whose wife pressurises him to get a set top box for her and he goes out with his friend who is a drug peddler, Peter (Venkatesh Harinathan) to fulfill her wish for their wedding anniversary. But to their misfortune, both Manohar and Peter are threatened by gangster Veerabadhran (Deepak Bagga) and his sidekick to close a deal for them. However things go awry for them as they land in a retired gangster Kali Muthu’s (Nassar) place for help, but it only lead to another mishap.[9]

Das kidnaps Arumai, the son of a politician who has been planning his own kidnapping to extract money from his father. Problems arise when an insane police officer is brought to handle the case.

A boy raised in a cemetery grows up with no social skills, and leads a turbulent life readjusting once he moves out of the cemetery.

Ramachandran (Sathyaraj) is a police inspector who is sentenced to the death penalty. His teammates release him in secret and Ramachandran begins by killing the criminals one by one.

Rajan Zachariah, an Inspector of Police working in the Palakkad District on the Kerala-Karnataka border, investigates a murder case that is very important to him.

A handicapped man Krishna (Suriya) arrives at Mumbai from Kanyakumari at a train station after boarding a train from there. He, along with a taxi driver Raja (Soori), travel around Mumbai to look for his elder brother, Raju. Raja tries to get to know about Krishna but is unable to get any details about him from him. Krishna rents a hotel room, takes a shower, and changes his clothes. He gets Raja to take him to a club, where Krishna then tries to meet an old associate of Raju named Amar, who is a very powerful gangster through his henchmen, but fails. He then meets a close friend of Raju named Rajiv (Asif Basra), who overheard his conversation with Amar’s henchmen. Rajiv tells Krishna that Raju is Raju Bhai (Suriya), a powerful and feared gangster. He then tells things to Krishna about Raju, until he passes out from being drunk.

A taxi driver unwillingly became accomplice to goons

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).

The film starts with Dhivakar (Vincent Asokan) and his family celebrating his birthday. A sudden lightning strike kills him and his son. At a movie theatre, a man gropes a woman, and a small commotion ensues, which was stopped by ACP Paul Dhanarajan (Aadukalam Naren). The plot shifts to detective Kaniyan Pongundran (Vishal), who lives with his associate Manohar (Prasanna). They both come across Mallika (Anu Emmanuel).
One day, a schoolboy Naveen (Master Nishesh) visits Kaniyan and Manohar with a case that his pet Pomeranian Nemo was shot dead and asks them to find the killer. Naveen gives them the bullet from Nemo’s body. Kaniyan finds that it is a 9mm bullet which had been ricocheted from Nemo. At the crime scene, he finds a tooth, with which he tracks its owner as Swarnavel (Ashvatt). Meanwhile, Kamalesh (John Vijay) visits a travel agency to deliver a sofa stashed with money to five members who run the agency: Devil (Vinay Rai), Muthu (Bhagyaraj), Pritha (Andrea Jeremiah), a stout man (Dheeraj Rathnam), and a bald man (Siddhanth Venkatesh).

Krishna fights to avenge his sister’s death and the future of medical students in this action-packed thriller.

The filmmaking lacks the zaniness that such a screwball premise requires and the TV serial-like visuals take some time getting used to.