The film starts off with a night of November 1942 in Calcutta, with a narrative by Detective Byomkesh Bakshy (Sushant Singh Rajput). When he is busy playing in the sports room, Ajit Banerjee (Anand Tiwari) approaches him to solve the case of his missing father Bhuvan. Then, a very practical Byomkesh Bakshy tells him that he doesn’t want to accept this case and gives him all the possibilities of his father to have gone missing.
A very upset Ajit, then, slaps him in front of everyone. The very next moment, we see Byomkesh Bakshy taking up the case and trying to recreate all sorts of possibilities, which could lead him to cracking the case. And when Byomkesh Bakshy really gets to searching by going hammer and tongs over the case, he lands up discovering that Bhuvan had not gone missing, but had been mercilessly murdered. And then starts his journey to find the killers of Bhuvan. As and when the case progresses, he keeps on meeting various characters, who in turn, lead to various twists and turns in the film, which also includes merciless murders at regular intervals. In the meanwhile, while he is investigating the case, a very seductive Devi/ Anguri (Swastika Mukherjee) tries her level best to seduce him. As the case progresses, Byomkesh Bakshy, suddenly, chances upon a very mysterious map.
What is the mystery of the map, does Byomkesh Bakshy become successful in nabbing the culprit of Bhuvan, the reason behind his assassination and also the culprit behind the series of murders and the reason for their murders is what forms the rest of the film.
Sushant Singh Rajput pulls off the role with aplomb and becomes the character rather than a hero, who must be invincible because of his status in the film. Sushant’s Bakshy is more of Tintin than Sherlock and the actor is careful to not let the sleuth become larger-than-life. With his slicked hair, a cigarette dangling from his lips and an endearing smile, Sushant simply wins your heart with his performance. Anand Tiwari, who has been mostly seen playing comic characters, makes you sit up and take notice of his character, an Indian Watson, who might seem geeky with his glasses and diminutive stature, but who is quick with his fists when the situation calls for it even as Byomkesh timidly implores him to not engage in fisticuffs. Swastika Mukherjee, who plays the enigmatic Angoori Devi, plays her part well and other actors like Meiyang Chang, Neeraj Kabi, Divya Menon and others, too do justice to their roles.
On the flip side, DBB is not what one might call an ‘edge of the seat’ thriller and so, won’t be having you biting your nails off in the excitement of uncovering the mystery. Dibakar takes his own sweet time unraveling the enigma, but if you want to soak in the experience of an old-school noir, Detective Byomkesh Bakshy! is definitely your cup of tea.