Krishnakumar is an orphan and a policeman who lives with his younger sister Sheela. Sheela falls in love with her classmate Babu and Krishnakumar accepts him as his brother in law. But tragedy strikes the couple on their honeymoon when Babu is beaten into a coma and Sheela raped and killed. The police arrest four middle-age friends who follow them. But Krishnakumar discovers that his sister's murderers are actually Babu's three classmates who are freed thanks to M. S. Menon, one of the killer's father. Krishnakumar seeks revenge.