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In the Malhotra household, a young woman (Urmila Matondkar) is preparing to spend a quiet evening with her pet kitty, watching cable television. The doorbell rings, and she sees through the peephole that it is a young man, who later identifies himself as Sameer A. Purnavale (Manoj Bajpai), claiming to be an employee of Mr. Malhotra. She is reluctant to open the door, even to talk to this stranger, as the police had just issued a warning about a killer at large in this area. She does offer him a sandwich, but he tricks her into opening the door, and lets himself in on the pretext of protecting her from an unknown person, who is making a noise elsewhere in the house.

When no one is found, she asks him to leave, and opens the door, and finds another man with a gun, who later identifies himself as Police Inspector Qureshi (Sushant Singh). The two doubt his credentials, and Sameer phones the nearest police station and calls for help. The two men then get into a fight, and she gets hold of Qureshi's gun, and asks them to sit quietly. It is then revealed that the man claiming to be Inspector Qureshi is in fact a thief. She telephones her mother and ask her to contact the police.

Sameer later goes upstairs and comes across the dead bodies of both Mr. Malhotra and the thief. As he turns around, the young woman is standing there holding a knife, laughing. She turns out to be the serial killer and a mental patient who escaped from a mental hospital. She tricked the two men into believing that one of them is the killer, though the killer was in fact her. It appears that the young woman murdered Mr. Malhotra and took his house and named it as "The Gupta House". She then murders Sameer and disposes of their dead bodies. The film ends the next morning with a door bell ringing asking if the real owner still lives there and she looks at the camera and smiles.