The film begins with an aged man entering a graveyard to lay flowers on someone's grave. He hears the noise of someone struggling in a coffin nearby. He digs into that place and opens the coffin. To his utmost surprise, he discovers a girl buried alive in the coffin. He takes the girl and admits her to the hospital. Inspector Anton Veldez (Siddharth Kher),the officer-in-charge of the case, tells the doctor to let him know as soon as she regains consciousness and asks one of his officers to stay alert in case the girl is attacked again. Interestingly, that very officer turns out to be a dishonest one and calls an anonymous person informing him of the girl being alive. He, then, secretly enters her cabin for a second attempt to kill her and this time too, by suffocation. He presses a pillow on her face and she manages to press the alarm button. This causes the nurse to rush to her cabin. The officer goes out of the cabin pretending to be unaware of the attack. Now, that the girl has become conscious, the doctor calls Inspector Anton. When Anton, along with the doctor, goes into her cabin, they find her missing. Anton, frustrated, sends his officers to look for her and himself goes to the ground floor to meet the dean. While he is waiting for the lift, he remembers the monitor in her cabin still working meaning that the girl was right there when they entered. He goes back to the cabin but the girl had already escaped. She crawls her way to the store room. The girl is revealed to be Sonika (Surveen Chawla) and is a mistress of a powerful and influential political leader Mandar Mhatre (Sushant Singh). Sonika is a photography student. Sonika is kept isolated and tortured by Mandar. She reluctantly finds comfort in her college friend Akshay Bedi (Jay Bhanushali) who secretly loves her. They both fall in love but Sonika is helpless since she can't tell Akshay about her being the mistress of Mandar. Akshay gets to know the truth and comforts her. They both move to a different home and decide to spend their lives together. They declare their love and have sex. Sonika is happy and finds some hope that she will be free from the torture that she had to tolerate. Mandar tries to find Sonika but she is no where to be found in her house. Later on he gets to know that she has eloped with her lover. Mandar and his men reach Akshay's house and attack him. Sonika cries and pleades Mandar to leave Akshay but he refuses to. Mandar's men kill Akshay by tying him to a rope and throwing him in a lake in a car. Mandar also buries Sonika alive in a coffin. After she is rescued she vows to extract vengeance upon Mandar for murdering Akshay and for herself.She at first kills the police officer who tried to kill her.Then she writes a diary describing about her torture.She dives inside the same lake and puts it in the car.She then kills one of the three men who were involved along with Mandar in killing Akshay.She then informs Anton about Akshay's dead body.However eventhough Anton gets hold of Akshay and the diary Mandar makes it look that Sonika killed Akshay. Sonika then again manages to put everything in right order and kills the another man of Mandar involved with Mandar in killing Akshay. Then Sonika teams up with Mandar's arch rival and get hold of the third man of Mandar involved in killing Akshay. However all of a sudden Mandar himself kills that person. It is revealed that the arch rival had becomes patner after Mandar offered to share his seats with him in election. Mandar makes it look that sonika did it and thus police officer catch her. However she manages to escape with Anton's help. Then Sonika kills Mandar with Mandar's wife's help (who came to know about Mandar's wrongdoing accidentally).