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The film opens in UK where Colonel Viren Nanda (Jimmy Shergill) goes to meet a wanted terrorist Omar Zafar (Danny Denzongpa) in his holding cell. As Viren informs Zafar that he will be extradited back to India for his crimes, Zafar's men enter his holding cell, led by Hamid Gul (Jaaved Jaffrey), murdering all guards around them, with Zaffar then murdering Viren by shooting him and then burning him. As Zaffar escapes in a helicopter waiting on the roof, he puts a $5 million reward for someone to steal the Koh-i-Noor diamond from the Tower of London, but with one condition – the thief must be Indian, to hold up a new extradition treaty between India and UK. Soon after, a man named Rajveer Nanda (Hrithik Roshan) steals it, and when Zaffar's men are informed of the theft, they travel to Rajveer for the deal. Although they initially travel with the $5 million reward, Rajveer informs them that he now wants $20 million for the deal. Following the disdain of the comment made by Rajveer, a fight breaks out between Rajveer and Zaffar's men after which Rajveer flies away. After Rajveer escapes, a CCTV footage of him is captured, showing that he is in Shimla. Following Rajveer's escape, he sees Harleen (Katrina Kaif) sitting in a restaurant, who is there waiting for her internet date, "Vickie", to show up. Rajveer enters the restaurant posing as "Vickie" and woos her over. He convinces Harleen to use the bathroom and while she is in there, Rajveer fights the remaining men and leaves the restaurant, much to the dismay of Harleen. As she drives home, Harleen accidentally runs over Rajveer, who asks her to stitch up a gunshot wound sustained during the fight. Rajveer then gives Harleen drugged water, with her complying with what he says about the government officials, informing her about where to find guns underneath car seats and what they will say about him.
