Dinu Dutta is researching the myth of the Gun Merchant for a book. He travels from Brooklyn to Calcutta and the Sundarbans to learn more. He meets several characters involved in climate change issues like Piyla Roy. Dinu learns different versions of the Gun Merchant story and visits the shrine of Manasa Devi. Tipu is bitten by a snake there and has visions. Dinu later travels to Venice to help with a documentary on migrants. He encounters the migrant community and learns the Gun Merchant story may be historically linked to migrants from Bengal to Venice hundreds of years ago.