The story is about a young happy-go-lucky man Shakthi (Madhavan) who comes to town in search of a job. He stays with his uncle Gangaraju (Vadivelu). Shakthi falls in love with Valli (Reema Sen), a small time magician, displaying her tricks at exhibitions.
A series of murders rock the city. A treasury officer and a theatre owner are killed. The government appoints Bhagyaraj to investigate these killings. Next in line is Petrol Shankar, a man serving a jail sentence in the bus burning case, who is out on parole.
The police officer, who starts work on the case, suspects that Shakthi could be the killer, so Shakthi is arrested. The police later realize that it is the handiwork of a look-alike of Shakthi, so he is released. Shakthi tries to multi-task - make his career, get Valli and figure out who his blue-eyed lookalike is, the police try to solve the mysterious murders in various cities. Gangaraju pads through his suddenly-chaotic life with his comedy creating a laugh-riot.
At this stage Krishna (Madhavan II) with smoky eyes, enters the scene. He meets the police officer and confesses him that he is the real killer. He outlines the reason for the killings. His family and his lover Jyothi (Anushka) had been killed by the gang, in a horrifying conflagration, and he was rendered nearly blind by the same fire. So he is now taking his revenge by eliminating them. The last man surviving in the gang is Rakesh. Krishna takes on Rakesh; in the final fight, they both fall into a great fire. Krishna manages to kill Rakesh, but also ends his life in the process.