Chandangadh Thakur family's safe vault could be opened only with original four KEYS. When Thakur saab comes to know that his manager Lalchand's intentions are bad he hides the four valuable Keys in each locket of his four children while they are asleep. Lalchand kills Thakur but he could lay his hands on only one key before he could gather the other three keys, Lalchand gets caught by the police and he is sentenced.
All four children get seperated from the mother while escaping from the clutches of Lalchand Among the four children was Raju whose locket was in the evil hands of Lalchand.
All the four children grow up along with the hurdles of time. One of them was the honest straight forward Bhola the other was Raju who cheats other people to make a living, third was Babloo who had become an intelligent police officer and the youngest was Papoo who is a notorious thief and playboy. All these were smarter than the each other.
On the other side was the mother who after the death of her husband and the loss of her children had gone insane, and she used to make idols of her children. Every son meets the mother in strange circumstances but none of the mrecoginse each other.
When Lalchand after completing his sentence in the prison comes out he comes to know that three children with remaning three keys are alive. Fate strikes at these four men again. To get hold of the three lockets Lalchand hires a man who by unfortunate luck happens to be the second child Raju, a plot where a brother tries to cheat his own blood to get hold of the lockets.
Was the mother able to meet her children?
Could Raju get all the three lockets from his brothers?
Did all the four children take revenge on Lalchand avenging for the murder of their father.
There is only one answer to all these, See "HUMSE BADHKAR KAUN".
(From the official press booklet)