Plot
Vishal (Riaz) and Dr. Vasudevan (Yog Japee) wake up one day to find out that they both are stuck inside a square room devoid of any furniture. The only other element in the room apart from the two of them is the dead body of a man lying in the middle of the room, blood soaked. Vishal and Vasudevan do not know each other. Soon, Vishal realizes that there is a tape recorder near him, he finds a cassette in his pocket, which he plays. The cassette welcomes him to the SQUARE and tells him that his only way of escaping is by finding a clue that only the guy opposite him can see. Soon, Vasudevan plays the cassette from his pocket, and the recording again welcomes him to the SQUARE and tells him that he has been doing a lot of good by saving lives as a doctor, and yet he has committed a grave mistake, which he is now getting punished for. He is told that there is only eight hours remaining for him to escape, and his escape would only be by killing the one opposite him. Vishal, unwilling to cooperate with Vasudevan, cries and screams, asking the kidnapper to let him go. Finally coming to terms with their capture, encouraged to think objectively by Vasudevan, Vishal gives in. They both start working together to find out ways to escape by charting the clues the kidnapper gives.
Meanwhile, on another plane, Siva Subramaniam (Roheit Nair), working in a multinational company, is told that he has been selected as the "Employee of the Decade" and will have to collect his coveted award from their Delhi Headquarters. He comes home to a good news that his wife Dhivya (Suja Varunee), who is pregnant, has conceived twin babies. Overly rejoiced, the couple celebrates their good luck.
As Vasudevan and Vishal discuss, recall, and think, we uncover their personal lives. Vasudevan, a reputed doctor from a government medical centre is married and has a teenage daughter. However, he has an ongoing relationship with one of his trainee students – Dr. Preethi (Sanam Shetty). While he is honest for the most part of his professional life, he is threatened by another trainee student Dr. Shankar (Brihadish Kaushik) to rewrite a postmortem report of a rape victim in favour of the accused (an MP's son). He is threatened with photos of him with Preethi. Scared, Vasudevan sells out.
Vishal, on the other hand, is a photographer who takes pictures of people in their intimate moments, mostly done on request by certain clients. One such assignment he was given by Shankar was to follow and take pictures of Vasudevan along with Preethi. Vasudevan gets shocked upon knowing that Vishal already knows him and is partly the reason why he is in the SQUARE.
Meanwhile, Siva and Dhivya prepare to leave to Delhi to receive his award, but their flight meets with a tragic accident.
Back in the square, Vasudevan tells Vishal that a few months earlier, a lawyer was killed brutally in a similar fashion of the dead man in the middle of the room. He says that he was suspected of that murder as he was the lawyer who had demanded that he change the postmortem report. Although his innocence was proved, one CB-CID police officer named Aadhi (Birla Bose) still suspected Vasudevan. Upon getting a certain lead, long after the case got over, Aadhi goes in search of the killer (then deemed serial killer) sure that it was Vasudevan. The killer escapes from his clutches, in the process gravely injuring him, puncturing his vocal cord. Long after, Aadhi still tries to pin the whole case on Vasudevan, hoping to catch him at his weakest.
Vishal and Vasudevan suspect that their kidnapper might be Shankar. Vasudevan discovers that his wife and daughter have been kidnapped by him too, as a security measure in case Vasudevan tries to escape. Heartbroken and with no way out, Vasudevan starts realizing the value of his family, the love that they have for him, and the love that he has for them.
We go back in time to see that Dhivya finds out that Siva is terminally ill and has been undergoing treatment without telling her a word about it. She then breaks down and cries. Siva tells her that not everyone gets the best in life. He then asks her to appreciate what they have got in life.
Aadhi goes to Vasudevan's office, suspecting something. Inside, Shankar holds Vasudevan's wife and daughter captive. They try to escape and hear a gunshot. Aadhi arrives at the spot. Shankar escapes from him and heads elsewhere.
Vasudevan, unable to wait for rescue any longer and losing his patience, decides to break free by cutting his leg free from the chain. Vishal tries to stop him. Vasudevan shoots Vishal, like the kidnapper commanded earlier, and breaks away to leave the square. Meanwhile, Shankar and Aadhi have a tough fight, at the end of which Shankar kills Aadhi. He comes to the square to finish the two of them. However, Vishal regains consciousness and kills Shankar in the process. Vishal also realizes the Vasudevan had carefully shot him on his shoulder so as to not mortally injure him. Vasudevan then escapes the square. Vishal tries to escape by checking for the lock code from Shankar's body when the dead body in his midst wakes up. It is Siva, and he is the mastermind behind the whole square.
Siva, who upon recovering from his flight accident, finds out about the girl's rape and how the lawyer, Shankar, and Vasudevan played their part in defending the convict. He realizes that Vishal was instrumental in instigating this and spoiling several other lives by clicking pictures of their intimate moments. He decides to destroy all their lives. He kills the lawyer first, pushes Shankar to kidnap Vishal and Vasudevan, and thereafter Vasudevan's wife and kid.
In the end, Siva tells Vishal that all he had to do was cooperate and work with Vasudevan to find his escape lock code, which is written right on his back. Siva tells him that he has lost and he deserves to rot in the square. Siva leaves the square, promising to return with others who do not appreciate their lives.
