A young Vijay witnesses his parents being shot to death by a masked person (who wears a bracelet featuring a white horse). He is adopted by a policeman and he grows up (as Amitabh Bachchan) with a haunting dream of a white horse. He joins the police and tries to bring law and order.
He befriends Sher Khan (Pran), a notorious club and gambling den owner and makes his leave his illegal business. He also protects a knife-sharper (Jaya Bachchan) and slowly they fall in love. In the midst, Vijay is framed in a bribery case and loses his job. But still he tries to get closer to his nemesis, and who all are responsible for him losing the job.
An unknown informed (Om Prakash) keeps tipping him on illegal deals and helps Vijay to reach the Don (who is also the killer of his parent's).
This film created the image of "The Angry Young Man" and made a big star out of Amitabh Bachchan.