A failed novelist, Arghyakamal Dutta ‘s dream was to get a novel called ‘Kolkatar Dwaityo’ published and create such a character who would undo all the wrong doings in the society, but it did not happen. He passed away, but before he wanted his grandson who is extremely close to him to be ‘Kolkatar Dwaityo’ to keep his dreams alive. His grandson, Bablu who is taunted and teased by everyone in the neighbourhood specially Ronny,Jhonto and their friends, becomes ‘ Kolkatar Dwaityo’ complete with a mask and gloves which have pointed, long, sharp edges! He becomes the threat to all evil forces and becomes the darling of the poor and suppressed! The police are hot on his heels, but no idea who he is! The local councilor’s daughter is madly in love with this character. One day she receives a call from him and goes to meet him.Bablu kidnaps her and demands Rs 5 lakhs which he will actually give to Jhonto for his mother’s treatment. The police happen to know about his real identity somehow, but still they can’t catch him.The councilor gives Rs 5 lakh, but his daughter still doesn’t retern as she is aware of Bablu’s real identity and is in love with him. However Ronny and the cops do manage to catch hold of him and he is taken away by the cops. Meanwhile Ronny manages to get hold of Tumpa and tries to act fresh with her, but she somehow overpowers him and goes to her father. They go together along with Jhonto to free Bablu.The entire city also comes to know about the bomb threats of the terrorists thanks to the posters posted all over the city by Bablu and Tumpa.The chief minister decides to reward Bablu and he lives a happy life with Tumpa.