A literary novel by Amitav Ghosh that blends mythology, history, migration, and climate fiction. The story follows Deen Datta, a rare-book dealer from Kolkata, who becomes fascinated by an old Bengali legend about the "Gun Merchant." His search for the truth takes him from the Sundarbans to Venice, where he encounters refugees, environmental upheaval, and mysterious events that seem to connect the past with the present. The novel explores climate change, displacement, globalization, folklore, and humanity's relationship with nature.