Seeds of crime and ploys of destruction lurk in an erstwhile royal fort. Satyanweshi Byomkesh Bakshi returns, along with Ajit and Satyabati, to unravel the mysteries in the dark hallways of the fort, in Srijit Mukherji’s adaptation of Sharadindu Bandyopadhyay’s 1952 novel, Durgo Rawhoshyo