Yeh To Kamaal Ho Gaya

Shady and corrupt lawyer, Rashik Bihari Saxena, frames an innocent child, Mahesh Chander, the son of a convicted thief, for murder. Mahesh is sent to juvenile jail for several years. His father, Shankar, swears vengeance against Advocate Saxena, and abducts one his children, a boy, and names him Ratan. He and his wife, Shanta, nurture him and let him grow with them. Shankar teaches him all the tricks that would make him a master cat burglar.

Years later, Ratan has grown up to be a master cat burglar while his lookalike brother, Ajay Saxena, is studying in London. Ajay returns home with a Caucasian wife, Kathryn, who is not welcomed by Advocate Saxena, as a result Ajay too leaves the house. Then a woman named Ruby Gupta is killed, and the evidence links this crime to Saxena. The police arrest him, and a trial is conducted. In the meantime, Shankar asks Ratan to take Ajays place in the Saxena household, which Ratan does so.

As a result, Ajay is framed for a robbery, is arrested and held in jail. With both father and son awaiting respective trials, it looks like Shankar is going to have his vengeance after all.