Ivide Thudangunnu (1984)

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