The movie begins with Niya (Doyel Dhawan) watching a video of herself and her father. Niya is the daughter of Maya (Bipasha Basu) and Abhay (Nawazuddin Siddiqui). Maya and Abhay are divorced. Maya and Niya live with Maya's mother (Shernaz Patel) and father (Shiv Kumar Subramaniam). Niya is unaware of the fact that her father is dead. Maya deliberately hides the truth from her as Niya is a sensitive child and worships her father. Things start getting bizarre when Paras, Niya's classmate who gives her a hard time in school, ends up dead after he pulled Niya's hair. Same thing happens to Niya's class teacher Mrs. Sharma who complains about Niya.
Moreover Niya starts talking to her absent father. Maya is concerned about the absurd change in Niya's behaviour and hence takes her for counseling. It is revealed in the counseling session that Abhay was a hot tempered man. He loses out on his job and friends because of his frequent and violent bouts of anger. Abhay also suspects Maya of having an affair with a colleague. However he loves his daughter more than anything else. After Abhay starts beating up Maya, she files for a divorce and gets the sole custody of Niya. Abhay cannot bear this and threatens Maya that he will take Niya away from her. Shortly after the hearing, Abhay dies in a car accident. After the session, the counselor (Mohan Kapoor) advices Maya to take Niya out for the weekend. The mother daughter duo go to Panchgani where Abhay possesses Niya and tells Maya that he will take Niya with him. Maya comes back to Mumbai and consults a pandit (Darshan Jariwala) who tells Maya that as long as Maya and Niya share a strong bond of love, Abhay won't be able to kill either Maya or Niya.
Some time later, the counselor tries to convince Niya that her father is dead. Shortly after, the counselor is found dead in his clinic. Later, Abhay kills Maya's friend and frames Maya. Maya is admitted into a mental health facility. Maya's mother calls the pandit home for a havan, which is interrupted by Abhay. He kills the pandit, possesses his body and kills Maya's mother. Maya, in a desperate bid to save her daughter kills herself as she remembers the pandit's words that no mortal man can fight an Aatma.
Maya becomes a spirit and saves Niya just as Abhay is about to kill her. She also destroys Abhay's spirit, thus ensuring Niya's safety for the rest of her life. In an epilogue, Niya is shown celebrating her eighteenth birthday while Maya fondly watches her