Ali's (Uday Chopra
) dream of becoming a police officer has come true. He is now ACP Jai Dixit's (Abhishek Bachchan
) ‘right hand man'. Together, they are trying to keep a tight leash on the crime in India. Little do they know what they are going to be up against.
Enter Aryan - Mr. A (Hrithik Roshan) - A hi-tech international thief. After pulling off a series of impossible heists all over the world, his next target is Mumbai, India. The case is given to ACP Jai and Ali. Helping them put the pieces of the puzzle together is ACP Shonali Bose (Bipasha Basu), Jai's college mate, now a police officer in her own right. For the last two years Shonali has been tracking these amazing thefts and is now an expert on this thief, who no one has seen.
Once in Mumbai, Mr. A finds his match in Sunehri (Aishwarya Rai), a petty yet clever thief. She makes him an offer he finds very hard to refuse. A partnership! Aryan accepts.
And so the game begins -- a game of cat and mouse -- a game of good vs. bad.