The movie opens with Siddhant Dheer (Sanjay Dutt) as the head of the Anti-Terrorist Cell (a fictitious organisation) uncovering the fact that on May the 10th ('10' in Hindi is 'Dus'), a terrorist attack will take place that will kill 25,000 people. All that is known about the attack is the name of the man behind it: "Jambhal".
Neha (Esha Deol), an agent in Canada, reports to him that one of Jambhal's men, Himat Mehendi, is in a Canadian jail. Siddhant's younger brother Shashank Dheer (Abhishek Bachchan) and co-agent Aditya Singh (Zayed Khan) are sent to kidnap and interrogate Mehendi, keeping the mission unofficial and secret from the Canadian authorities. But things become even more complicated when Siddhant finds that there is an unknown double agent in their midst which forces him to suspect Aditi Kumar (Shilpa Shetty) his love interest and co-agent.
On arrival in Canada, Shashank and Aditya find that the car that had been provided by Neha is rigged to explode if they slow down. A Canadian police officer Dan (Sunil Shetty) chases them apparently unaware that Shashank is driving beyond the permissible speed limit to avoid explosion. After Mehendi (Pankaj Kapoor) is captured, the agents are intercepted by Dan again on a deserted culvert. Here the terrorists attempt to recapture him; Shashank and Aditya fight them off. Dan is caught in the crossfire. Despite their misgivings about blowing their cover, the agents take him to Neha's safehouse. After recovering, Dan joins them.
Himat lead them to a man named Asif, who he claims has turned against Jambhal, along with a man named Irfan. Asif gives them Jhambal's location, and then immediately shoots himself. which Himat says is because of his fear of J.D. Dan and the agents then kill 'Jhambal' in the countryside, and release Mehendi.
All is not as it seems, however. Returning to Neha's safehouse, they find only Siddhant and a body Siddhant claims is Neha's, but is not that of the 'Neha' previously seen. It becomes apparent that the woman they thought to be Neha is a double agent, and the real Neha is dead. Moreover, the man they killed was not J.D, but Irfan, the second traitor. The real 'Jhambal' was Mehendi, and is now free. In fact Neha had rigged the car in the beginning in order to terminate Shashank and Aditya. When she failed she had covered saying that it was a test.
Siddhant also knows that the name of the mission is 'JEET'. He believes that the letters in 'Jeet' refer to their numerical position in the alphabet: 10th, 5th, 5th and 20th respectively. He knows that 10/5 refers to the 10th of May, and believes that the second 5 refers to 5pm, the time of the attack. From that the surmise that the final '20' refers to the 20,000 that will be killed; the only place where such a crowd will be concentrated at that time is a special exhibition football match between India and Canada, with the Prime Minister of India present.
At the stadium, Aditya finds 10 C-4 bombs in a car with the registration 2020. He drives off, attempting to get the car as far as possible from civilization. Shashank finds another bomb and, realising there is not enough time to drive it into the countryside, he takes it to the airport. He meets the double agent Neha, and, after he kills her bodyguards, they both confess their love for each other, pack the bomb onto an aeroplane and take off.
Aditya manages to bring the bomb into the wilderness, escapes from the car onto a helicopter, and the bomb explodes without loss of life. Shashank, however, is unable to find a place to drop the bomb safely, and crashes the plane into a lake, killing himself and Neha. Siddhant confronts an unarmed J.D. in a hotel elevator and shoots the terrorist down, but he is forever shaken by the death of his brother. The film went on to become a huge hit despite the competition from many other films releasing around that time.
