The movie begins with an investigation of a girl who has been dead along with a small vessel. That small vessel is actually a weapon as it contains explosive chemicals (a bomb named “Ophalaska”) with its changing colours.

Now comes the quarreling between two gangs, in which one gang is headed by Sarveshwaran (R. Sarathkumar). He lives in Kumbakonam along with his men. Another scene opens in Pollachi, where Surya (R. Sarathkumar) is an unemployed youth. He lives in a bungalow with his joint family. Maha (Meera Nandan) falls in love with Surya. Surya sees a metal sheet written in Chinese. When he magnifies that, he sees a Chinese script along with some Tamil words.

A caste-obsessed society causes the death of a young women and her lover at the hands of her own brother.

Over half-a-dozen lover couples go missing and an Assistant Commissioner of Police takes up the investigation.