Earlier titled as Waapsi, this film revolves around Calcutta Mail and is the story of Avinash (Anil Kapoor) who arrives in the city of chaos in a train named Calcutta Mail. Avinash had great curiosity in his heart while coming to Calcutta but very soon, he realizes that things are not as fine as they seemed. He understands that someone is after him, keeping constant vigil on his every move. And unfortunately, he doest know who it is. Avinash lives in a tenement where several other interesting and mysterious characters are around him. Avinash is an absolutely ordinary man who has no super-hero things in him. He comes to Calcutta in search of something. He happens to come across few others while strolling in the streets of the city. Important among these characters are Rima (Rani Mukherjee), a novelist, Sujan Singh (Satish Kaushik), a politician, Ghatak (Saurabh Shukla), inspector Rastogi (Sayaji Shinde) and others. Interestingly, Rima is heading a life that has double identities and Avinash is amused, maybe worried as well, about who this girl actually is.