The film starts with a girl named Barkha Khanna, supposedly killed by a vengeful ghost in her room which is later noticed by her husband, Karan Khanna, a political figure from Britain. London police subsequently arrest him accusing him of killing his wife. Meanwhile Simran (Sanaya Irani), a lawyer having own stress related issues and use morphine and is going through an emotional time as her father recently passed away and her boyfriend (a judge) too broke up with her. Simran after the reluctance of Karan's campaign manager Bob agrees to take the case. After getting him out on bail, she learns that Karan and Barkha were not a happy couple and Karan on Valentine's day saw someone sending a locket to Barkha. Karan suspected that his wife is having an affair and himself started an affair. However his wife was killed one night and the CC Tv visuals shows Karan entering his apartment at 2am and leaving at 4am(which is the time of death of his wife) and again entering the apartment at 6am and all the evidence is pointing against him. But he claims that he spent that night at Bob's apartment as he was not able to drive.
Meanwhile Bob notices something and went to a mental institute in Leeds and called Karan telling him that he knows who's spirit is doing all these but before he could tell who is behind all these, Bob himself is killed by that ghost who had previously killed Barkha. After more investigation Simran found that Karan was with a girl on the night his wife died but that girl was missing in police report. After consulting to a demonologist it was revealed that that girl was possessed and Karan was also possessed and being under possession he actually killed Barkha and that's why he didn't remember that night very much. Further it was revealed that Barkha was in a lesbian relationship with a girl but after instead married Karan for fame and money. When that girl blackmailed Barkha to tell the truth or bare the consequences, she was taken to the mental institute . There she met Simran's father (Vikram Bhatt),a doctor. That girl committed suicide so that she can take revenge on those three after becoming ghost. She gave a locket previously to Simran's father and told him to deliver it to Barkha after her death. It was also revealed that the locket had all the power.
Later that missing girl was found dead and her blame fell upon Karan. Simran with the help of her ex-boyfriend executed an exorsism during which the ghost took control over Karan. Simran meantime broke the locket in nick of time and thus Karan got saved and finally proving his innocence. Karan and Simran confesses their love for each other. Later Karan gave a party in his house after winning election and an inmate of that deceased girl gave him a box which unknown to Karan had that broken locket inside indicating that the curse was not over yet.