Na-Insaafi (1989)

Widowed Judge Kedarnath Sinha lives a comfortable life with two sons, CBI Inspector Vijay and college student Sonu. Vijay is aware of the terrible tragedy that marked his 5th-birthday celebration: the party was interrupted by vengeful escaped convict Billa, who killed DCP Ravi Khanna, cut off Kedarnath's right hand, and abducted and brutally assaulted and raped Sharda Khanna. Sonu doesn't come to know about this until well after his 25th birthday, when Kedarnath tells him that he is Sharda's and Billa's son. Shocked and devastated, Sonu accepts this reality and leaves the Sinha household. Shortly thereafter, he is wanted by the Police for helping dreaded killer Kaalia escape from prison. What Kedarnath and Vijay do not know is that Sonu helped Kaalia in order to reach Billa, but instead meets with Dagha, becomes his hit-man, and accepts a contract to kill Dagha's former associate Shakaal and retrieve a videotape titled "Marte Dam Tak". What is recorded in that video-tape is not that film, but something that will change Sonu's life forever and make him an enemy of the law, with Vijay hot on his trail.