The film stars Abir Chatterjee as the eponymous sleuth, while Ritwick Chakraborty enacts the role of his assistant Ajit Bandopadhyay and Sohini Sarkar helm in the shoes of Satyabati.

[7] In Benaras, DSP Purandhar Pandey invites Byomkesh Bakshi, Ajit Bandopadhyay and Satyabati to a party thrown by zamindar Deepnarayan Singh at his residence to celebrate his recovery after a prolonged illness.

[11] Initially, the character of Shakuntala was offered to Aditi Rao Hydari, who was recommended by Shoojit Sircar to the director, and would have made her Bengali debut.

Pass actor Shadab Kamal was selected to enact the role of the main antagonist, making his debut in Bengali cinema.

[13] Harsh Chhaya, June Malia, Rachel White and Subrat Dutta were selected to play prominent roles.

[16] Though in the book by Saradindu Bandopadhyay, Patna was the story's main backdrop, but director Arindam Sil decided to shoot the whole film with Benaras in the premise.

With usage of old aged instruments Bickram Ghosh had aptly recreated the semi classical format which was popular in Benaras during the period captured in the movie.