"Agnibaan" and "Uposonghar," two stories by Sharadundu Bandopadhyay, are combined in the film. The movie opens with a brief preview of another tale, "Satyanweshi," in which young Byomkesh arrests the head of a cocaine ring that is now on the prowl. On the other hand, a young girl who was holding a matchstick when she died under unexplained circumstances. A matchbox is given to him by a man named Kokonad Gupta, who declares to be a fan of Byomkesh.
