Nia (Doyel Dhawan) is the daughter of Maya (Bipasha Basu) and Abhay (Nawazuddin Siddiqui), who are divorced. Maya and Nia live with Maya’s parents (Shiv Subramaniam) and (Shernaz Patel). Nia is unaware of the fact that her father is dead. Maya deliberately hides the truth from her as Nia is a sensitive child and adores her father. Things start getting bizarre when Paras, Nia’s classmate who bullies her in the classroom, ends up dead. Soon after, Nia’s teacher, Mrs. Sinha, who complains about Nia, is also found dead. Moreover, Nia often starts talking to her dead father.
Concerned about the absurd change in Nia’s behavior, Maya takes her for counselling. It is revealed that Abhay was a hot-tempered man. He lost his job and friends because of his frequent violent bouts of anger and also suspected Maya of having an affair with her colleague, Pankaj However, Abhay loved his daughter more than anything else. After Abhay starts beating up Maya, she files for divorce and gets the sole custody of Nia. Abhay cannot bear this and threatens Maya that he will take Nia away from her. Shortly after the hearing and the pronouncement of the Family court, Abhay dies in a car accident. After the session, the counsellor (Mohan Kapoor) advises Maya to take Nia out for the weekend. The mother daughter duo do so but Abhay possesses Nia and threatens Maya that he will take their daughter away with him.
Maya consults a priest (Darshan Jariwala), who tells Maya that as long as she and her daughter share a strong bond of love, Abhay won’t be able to kill either of them. After the counsellor tries to convince Nia that her father is dead, the counsellor himself is found dead. Later, Abhay kills Maya’s friend Aakanskha for which Maya is framed and arrested. She is admitted in a mental health facility centre in confinement for treatment. Maya’s mother calls the priest home to get the home blessed from the evil spirit. Abhay kills the priest and Maya’s mother too. Maya, in a desperate bid to save her daughter, kills herself in the health centre confinement, as she remembers the priest’s words that no mortal can fight a spirit. Maya becomes a spirit and saves Nia just as Abhay is about to kill her by pushing her before a fast-moving local train. She also destroys Abhay’s spirit, thus ensuring Nia’s safety for the rest of her life.