Cast:Sushant Singh Rajput as Detective Byomkesh Bakshy: a young Bengali private detective.
Anand Tiwari as Ajit Bandyopadhyay: the sidekick of Byomkesh Bakshy, also an author.
Swastika Mukherjee as Anguri Devi: a dancer and spy, the character outline of Anguri is based on famous Frisian exotic dancer Mata Hari.
Divya Menon as Satyawati: the love interest of Byomkesh Bakshy.
Neeraj Kabi as Dr. Anukul Guha
Meiyang Chang as Kanai Dao
Aryann Bhowmik as Clinic Boy
Moumita Chakraborty as Leela
Mark Bennington as Deputy Commissioner Wilkie
Arindol Bagchi as Ashwini Babu
Manoshi Nath as Ruby
Anindya Banerjee as Prafulla Ray
Tirtha Mallick as Atanu Chandra Sen
Prasun Gayen as a Journalist
Peter Wong as the Underboss
Prashant Kumar as Factory Watchmen
Dr. Kaushik Ghosh as Gajanan Sikdar
Takanori Kikuchi as Dr. Watanabe
Piyali Ray as Watanabe's Receptionist
Pradipto Kumar Chakraborty as Puntiram
Sandip Bhattacharya as Officer in Charge
Shivam as Sukumar
Nishant Kumar as Factory Watchmen
Shaktipada Dey as Nibaran Da
Lauren Gottlieb (Special appearance in the song Calcutta Kiss)