The story begins with Sudha and Anand getting engaged. To celebrate, Anand throws a party and promises Sudha that he will pick her up. Anand fails to appear and Sudha drives to his estate. She gets stuck in the rain and knocks on the door of a nearby house. There she discovers the body of a girl. Suddenly she senses that she is being attacked. In the struggle, she falls from the roof. While unconscious, she is admitted to a hospital. When she returns home, she describes what she experienced that night, but no one believes her. She never recovers from the experience. Later, she starts a fight with someone in her imagination and tries to kill that person. A psychiatrist fails to bring Sudha out of her mental state. Her fiancé also tries to bring her to a normal condition. The psychiatrist later believes Sudha when she says a person in a TV program is the killer. He does some research, finds the house where Sudha was attacked, and takes her there, along with her family. Sudha is clear about what she saw that night: she saw the body of a girl and has the button of a dress as evidence. When they arrive at the house, she does not find the body. She discovers that the person whom she believes attacked her on that night is deaf and blind, that the person who was following her and later attacked her was a relative of the residents of that house and that the girl who died had gotten engaged to him prior to her death. He explains the reason he followed her was to describe the truth he knew to their family. Now a big question arises in her mind as the persons whom she saw and attacked both are innocent. She finds a tie pin in a corner of the house and later identifies it as the one belonging to Anand. When she goes to recover it at the house, she encounters Anand, who is there to retrieve it. When she confronts him, he explains the reason behind his involvement in the murder. In a flashback, Anand is hurrying through the rain to pick up Sudha, when he hits and kills a schoolboy. When he buries the body, a girl sees the incident, a girl whom he unintentionally killed. As is explained, he was bound to do this by 'ill fortune'. The mystery unfolds as he explains he is the person who joined Sudha in the hospital and disposed of the body of the girl. After admitting this to Sudha, Anand attempts to kill her, but eventually ends up committing suicide instead. Then, after everything seems to have been resolved, it is revealed that Sudha's friend Maya, who visited her a few times during the film, is also a figment of Sudha's imagination. In fact Sudha has been hallucinating Maya since her childhood and has made up her whole life story, including Maya having a daughter who also visits Sudha. The psychiatrist explains that Sudha has a positive mind which includes positive characters like Maya and a negative mind, where she had placed Prashant. When Sudha gets home, she sees Anand in her room and screams, leading us to believe that she has now placed Anand in her negative mind and he will now haunt her.
