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Jagmohan Lal aka Jugran is a crime lord who wants to climb up the crime ladder. When Customs Officer Verma tries to arrest him, he escapes. To save his skin, Jugran kills his twin brother Manmohan Lal and takes his identity. The world is led to believe that Jugran is still on the run. Jugran kills Verma and a Dr Ashok, destroying both their families in process. While Verma's orphaned sons Ramesh and Ravi are separated from each other, Dr Ashok's daughter Seema is left with her distraught mother, who has lost her sanity.
Many years later, Jugran has become a big name in the criminal underworld. He lives a double life, acting also as his twin brother Manmohan, who is highly respected in society. Ravi Verma meanwhile has become an Inspector and Ramesh has become a crook – a safecracker by the name of Romeo. The brothers are unaware of each other's identities, but there is one things that binds them together: one has a lock, the other has the only key that can open the lock. Seema too has become a crook, called Simmi, and her path starts crossing with Romeo's. Romeo is now working for Seth Girdharilal, who mentors many thieves and thugs like him.