The story revolves around Surjan Singh Shekhawat (played by Amitabh Bachchan), a police officer who is struggling with the loss of his wife. He is determined to solve a series of murders that are taking place in Mumbai.

The story takes a dark and thrilling turn as Surjan and Roshni get closer to solving the case, but they also have to confront their own personal demons and the truth about themselves.

As they dive deeper into the investigation, they discover that the murders are linked to a mysterious and notorious gangster, known as "Dev". The twist in the story is that Dev is actually a illusionist and a magician who uses his skills to evade the police and commit crimes.

The investigation leads him to Inspector Surjan Singh Shekhawat (played by Aamir Khan), who is a cop with a troubled past. He teams up with a beautiful and intelligent DSP, Roshni (played by Kareena Kapoor), to solve the case.