Vikram (Sidharth Malhotra) is an acclaimed British writer and NRI. On the night of the launch of his second book in Mumbai, he returns to his hotel to find his wife, Catherine, dead and calls the police. After the police arrives at his place, he evades them and speeds away in his car. While the cops are giving him a chase, his car overturns. He manages to escape with minor injuries and attempts to take shelter in a nearby apartment. Later that night, Maya (Sonakshi Sinha), a young homemaker who resides in the same apartment, spots a police car outside and rushes to it for help. The police enter her flat and find Vikram standing next to the body of her lawyer husband, Shekhar Sinha, who’s been murdered. The police retrieve a blood-stained candle holder which was the weapon used to kill Shekhar. They also find burnt photographs in the trash can. Dev (Akshaye Khanna), a police officer investigating the double murder case, interrogates both Vikram and Maya.
According to Vikram’s account, he fled from the police because he feared he’d be falsely accused of killing his wife. His wife did not attend the book launch because she was not feeling well, and used to take medicines for a heart ailment. In a nearby apartment, he found Maya at the door of her flat and asked her for help when she was dumping something in the trash can. Vikram entered her flat and found the glass of the center table shattered. Maya told him that she had accidentally dropped a vase on the table. He also noticed that the bedroom door was locked from outside using a key. Maya attempted to seduce Vikram but he did not give in. The doorbell then rang and a tall man entered who Maya introduced to Vikram as her husband. Vikram finds a photo frame in the room and realizes that the man was not her husband but her lover. He attempts to flee but her lover hits him on the head with a candle holder and Vikram momentarily loses consciousness. Vikram gets up later to find her husband’s body next to him and the police at the door accompanied by Maya.