Banku, his mother, Anjali Sharma and father move in to their new house -- the Nath villa, unaware of the fact that the house is inhabited by a ghost. It is learnt the ghost is not too happy with his new housemates. But what the ghost is not prepared for is his unlikely friendship with Banku. Now Banku must uncover the reason why his ghostly friend is stuck and help him to attain salvation.

The film's female lead, Naina (Preity Zinta) narrates the story. Her father had committed suicide years ago which left a deep impact on her heart. Her family is dysfunctional since her mother and grandmother just cannot stop arguing. But when Aman (Shahrukh Khan) arrives next door, the whole gloomy conditions change. Aman infuses life in skeptical and overtly serious Naina, and she falls in love with him. But Aman knows that he cannot marry Naina because of a secret which he cannot divulge to her. So he intends upon setting her up with her best pal Rohit (Saif Ali Khan). Written by Soumitra