| Director | Fatih Akin, Thyagarajan |
|---|
The film revolves around Vasanth, a stock analyst, and his wife Malini. The two are in search of a flat in Chennai. Vasanth finds the perfect place on the 12th floor of a high-rise apartment building.
However, the apartment has a horrifying past. The previous occupant of the flat, Manju, killed her child and then jumped from the balcony and died. Malini learns about this incident and becomes oddly fixated with the story. Then, a series of inexplicable experiences drives her to near madness. Vasanth is convinced that she has developed some sort of psychological disorder. He consults a psychiatrist named Dr. Rajan and begins to doubt that his wife is suffering from a psychological disease. The couple's maid believes Malini to be possessed and calls in an exorcist.
Meanwhile, seemingly unrelated events take place around the building: the watchman was murdered with his head completely twisted; one of the residents, Ajay, behaves erratically; and a murder occurs. Inspector Paramasivam is sent to investigate the murder.
The exorcist spends time with Malini and learns that she is possessed by Manju. Vasanth goes to Manju's mother, and with her help, the possessed Malini lets everyone know that Ajay lusted after Manju and raped her, and to save herself, she jumped from her balcony. Later, Ajay realised that her daughter had witnessed the murder and got the watchman to throw the little girl from the balcony, and created a fake story that the woman had killed her daughter and then committed suicide. By killing the watchman via Malini, Manju takes revenge for her daughter's death and wants to kill Ajay. At the last minute, the mother comes and tells her dead daughter's spirit that she cannot take revenge on Ajay by making Malini a murderer, so Manju leaves Malini's body, and Ajay is thrown in front of everyone.
The story ends with Ajay going to prison and Parmasivam telling him to rot in a jail cell forever. After Paramasivam leaves the cell, Ajay finds himself face-to-face with Manju. He starts begging for mercy, but his voice fades out as she draws closer; it is implied that she kills him.