Aman Malik is an Indian Muslim commando on an anti-terror mission. He confronts Sultan, a terrorist leader, who challenges him to explain why he's fighting and tells him that he's only obeying orders for no good reason while he, Sultan, is a truly free man. Aman doesn't have time for a comeback before an explosion stirs confusion through which Sultan escapes.
Aman retires from the service and lives happily with his wife and daughter. Toward Divyi, his wife, he's rather condescending. She doesn't understand why terrorists do what they do. He answers: "If you can't understand anything, why think about it and spoil your mood? Change the channel and watch MTV!" He rebuffs Ahmad Hussein, a visitor from the police who hopes to recruit him for an undercover operation. He wants Aman to infiltrate the criminal gang of "RD," who has ties to Sultan's terrorists. He wants a military man because he doesn't really trust anyone in the police. Also, Aman can identify Sultan. Aman says no.
In the very next scene, Aman's wife and daughter are blown up by a terrorist bomb at a temple. It's a double blast and Aman is away from the first explosion. His family survived the first round, and he can see his little girl holding out her arms for him before the second blast. That image haunts him through the rest of the film, while the girl's rendition of "Twinkle Twinkle Little Star" morphs into some sinister lyrics that play over a montage of Aman training on the beach after he volunteers for Ahmad Hussein's mission. Here's a sample verse, as translated into English subtitles from the Hindi original.
Staying alive is a big problem.
Everything is an illusion.
The bird died after crashing into the building.
They will kill me after barging into my house.
The refrain is, "We should plant a bomb." I was hooked. Ahmad Hussein gives Aman a new identity (as Amaan Ali Yusuf), a criminal record, and a prison sentence. Ahmad's idea is that Amaan should get RD's attention by killing a prisoner that RD has so far been unable to touch from the outside, a minion of RD's great rival Goonga -- a buffoon who lives on a yacht so RD can't reach him. Amaan does the job with little trouble, with the desired result. He's taken out of prison by RD's lawyer, who we witness discreetly beating his wife for being slow about making coffee.
RD himself is a charmer. We see him torturing a prisoner and blaming his minions for the prisoner's death; they had not provided the proper voltage. One minion protests and strikes a karate pose, only to be told, "This is the age of Osama, not Bruce Lee." RD promptly puts Amaan to work on a reign of terror that ranges from gang hits to political assassinations. Feeling the heat, Goonga uses his pull with the police to recruit Dara, an "encounter specialist," i.e. a police hitman, to kill Amaan. Amaan gets word and ambushes Dara in his apartment. The pudgy killer manages to escape, but only after being chased naked through the streets until he can steal a sari off a mannequin. Made a laughingstock by the media, Dara is more determined to destroy Amaan, while the police issue a shoot-to-kill order against the mole.
Finally invited to meet RD face to face, Amaan is challenged by the karate guy, whose kung fu is very poor. His strikes have no effect, and Amaan beats him down while Iya, who we'll learn is RD's sister, watches with wary admiration. Soon after this, at about the one-hour mark, or halfway through the film, we have the closet thing to the stereotypical "Bollywood" musical number. The song is called Maula Khair Kare, and the refrain seems to be, "God, Be Kind."
Every death is dear to harmony.
Our business is to kill.
Blood flows in the vein.
It's important to shed blood.
Subtitled lyrics from CONTRACT closing credits