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 a priceless English crown by sky diving onto a train across the Namibian desert, disguising himself as the queen, stealing the crown, and escapes by sandboarding away.
He is pursued by ACP Jai Dixit (Abhishek Bachchan), his former classmate ACP Shonali Bose (Bipasha Basu), and Sub Inspector Ali Akbar (Uday Chopra), the comic relief. They try to catch him in the act as he robs a Mumbai museum, but they fail after a long chase with Mr. A on rollerblades.
Mr. A, in the meantime, is caught by the wiles of Sunehri (Aishwarya Rai Bachchan), who claims to be A's number-one fan. Attempting to catch Sunehri in the act, Shonali breaks her arm. Mr. A agrees to take Sunehri into a partnership, not knowing that she is actually working for the police or more specifically for Jai.
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 off 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 drops in unexpectedly but leaves them alone once Aryan hands over the details of where he has stashed the loot from all his robberies. Jai then talks to Ali over the phone and tells him to return to India, since they have a new case.
He is pursued by ACP Jai Dixit (Abhishek Bachchan), his former classmate ACP Shonali Bose (Bipasha Basu), and Sub Inspector Ali Akbar (Uday Chopra), the comic relief. They try to catch him in the act as he robs a Mumbai museum, but they fail after a long chase with Mr. A on rollerblades.
Mr. A, in the meantime, is caught by the wiles of Sunehri (Aishwarya Rai Bachchan), who claims to be A's number-one fan. Attempting to catch Sunehri in the act, Shonali breaks her arm. Mr. A agrees to take Sunehri into a partnership, not knowing that she is actually working for the police or more specifically for Jai.
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 off 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 drops in unexpectedly but leaves them alone once Aryan hands over the details of where he has stashed the loot from all his robberies. Jai then talks to Ali over the phone and tells him to return to India, since they have a new case.