It is one of the well made, well crafted portrayal of Byomkesh Bakshi. Nice set, 40's Kolkata, Old Mess bari of Kolkata all were nicely filmed. Don't compare it with old Byomkesh(Rajat Kapoor version one of the best), just enjoy it. Those who didn't read this story they will surely okay with it, and those who read this story (including me), from them some 'small' number of so called 'Critics' were looses their mind, posting blah blah blah..
They are okay when Marvel changed the story of 'Avengers' , they are okay with when Gui Ritchie changed the plot of Sherlock Holmes but they feel upset when it's happen in this film. Come on don't be double standard !!