Dinoo (Annu Kapoor) a poor farmer living with his wife (Anjana Mumtaz), his twin daughters and son is looted by Dacoits (Danny, Ranjeet and Gulshan Grover) who are in league with Chowdary (Prem Chopra).
The Dacoits not only kill Dinoo's son but also shoot him. Thus rendering his wife a widow and his twin daughter as orphans. One of these daughter lands up at the Kotha and the other mets Forest Officer (Pran) whose wife has been shot dead and children disintegrated by none other than the Dacoits.
The girl at the Kotha turns into a beautiful dancer girl Shanoo (Dimple Kapadia) and the other girl converted into lady Robinhood Durga (Dimple Kapadia) by her mentor Forest Officer. The destitute widow of Dinoo finds a small orphan boy and bring him up to make him Sheroo. (Chunkey Panday) and Chowdary get together and become Char Chowdary who have now employed a truck driver Birju (Shatrughan Sinha) to help in all their smuggling activities. Birjoo is none other than the Forest Officer's son. Being honest to the core, he tries to expose the Char Chowdary.
In turn they make life hell for him. However, somewhere along, he comes in contact with Durga and they fall in love with each other. On the other hand Shera detests the dancer girl Shanoo.
Eventually does the Forest Officer avenge his wife's death? Does he find her twin daughter? The answer to these lies in the extravaganza GUNAHON KA FAISLA.