The police are baffled by a master thief known only as Mr. A (Hrithik Roshan) because he leaves an 'A' symbol after each robbery. Mr. A steals the English crown by sky diving onto a train, disguising himself as the queen, stealing the crown, and escaping. He is pursued by ACP Jai Dixit (Abhishek Bachchan), ACP Shonali Bose (Bipasha Basu), and Sub Inspector Ali Akbar (Uday Chopra). They try to catch him in the act as he robs a Mumbai museum, but fail. Mr. A, in the meantime, is caught by the wiles of Sunehri (Aishwarya Rai), who claims to be Mr. A's number-one fan. Attempting to catch Sunehri in the act, Shonali breaks her leg. Mr. A agrees to take Sunehri into partnership, not knowing that she is actually working for the police. Mr. A and Sunehri fly to Copacabana, where Mr. A plans another big heist. The police officers, Jai and Ali, follow. While in Brazil they stay with Shonali's twin sister Monali and uncover that Mr. A's real name is Aryan. Aryan, who has trusted Sunehri with his life, finds out that she is working against him and accuses her of treachery. She then realizes that she loves him and joins him in earnest. Their heist is a success; their escape, not so much. In the end Sunehri shoots Aryan who falls of a cliff, though Sunehri claims she did it out of love. However, it is implied that even this was a last-resort faked death, planned out by Aryan and Sunehri, as in the end they are seen working at a restaurant. Jai comes by to visit them and then goes off to India for his new case.

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