Detective Byomkesh Bakshy! is a 2015 Indian Hindi-language mystery action-thriller film directed by Dibakar Banerjee and produced by Banerjee and Aditya Chopra. The story is based on the fictional detective Byomkesh Bakshi created by the Bengali writer Sharadindu Bandyopadhyay. The film stars Sushant Singh Rajput, Anand Tiwari, Neeraj Kabi and Swastika Mukherjee in principal roles. It was released on 3 April 2015 to positive reviews from critics but it became a commercial failure. A sequel with Rajput reprising his role was planned.
The film begins in November 1942 in Calcutta, where a group of Chinese men from the Green Gang are smuggling opium from the docks. An unknown gang attacks them and one of them brutally blinds the Chinese gang’s leader.
In January 1943, Ajit Banerjee (Anand Tiwari) approaches Byomkesh Bakshi (Sushant Singh Rajput) asking him to locate his father, Bhuvan Banerjee, who has been missing for two months. Byomkesh rejects the request initially but later takes on the case. The following day, he visits the lodging house Bhuvan Babu resided in, run by Dr. Anukul Guha (Neeraj Kabi), a physician. Byomkesh also meets Kanai Dao (Meiyang Chang), an opium seller and Ashwini Babu, Bhuvan Banerjee’s roommate.
Byomkesh finds Bhuvan Babu’s paan box, containing his custom-made formula, which was stolen by Ashwini Babu, who was addicted to the formula. Byomkesh then deduces that Bhuvan Banerjee has been murdered. He visits the closed chemical factory where Bhuvan Babu used to work, where he meets an actress, Anguri Devi (Swastika Mukherjee), the wife of the factory’s owner, Gajanan Sikdaar (Dr. Kaushik Ghosh). While Byomkesh interrogates her, he notices her nervously hiding her purse. When Anguri goes to film a scene, Byomkesh goes through the contents of the purse and finds a set of letters containing words cut out from the newspaper, blackmailing her husband Gajanan Sikdaar. Byomkesh deduces that Ganjanan Sikdaar has killed Bhuvan Babu, who was blackmailing the former. Byomkesh visits Gajanan Sikdaar’s residence where Sikdaar’s nephew Sukumar is creating his own political party against Sikdaar. Byomkesh is thrown out of the house when he tries to ask Gajanan Sikdaar about Bhuvan Babu.
Byomkesh and Dr. Guha go back to the factory and sneak in after conning the watchmen. While inspecting the factory, they find Bhuvan Babu’s slashed, decomposed body stuffed into a machine. Sikdaar is brought in by Deputy Commissioner Wilkie for questioning. However, Byomkesh realizes from the dates on Bhuvan Babu’s letters that they are fake and Sikdaar is being framed. Sikdaar is freed and Byomkesh follows him home but is stopped by Anguri Devi who attempts to seduce him. He gently rebuffs her and goes to meet Sikdaar, who immediately has a fit and passes away, having been poisoned. Suspicion falls on Sukumar, who was seen making death threats to Sikdaar. Dr. Guha leaves Calcutta temporarily but sends Byomkesh a letter and the stamp used on the fake letters, admitting that he was the one who faked the letters and killed Bhuvan Babu. Satyavati (Divya Menon), Sukumar’s sister, pleads with Byomkesh to help her brother, who she believes is innocent. Byomkesh finds the cab Sukumar was last seen in, and the driver drops him at a Japanese dentist, Dr. Watanabe’s office, from where Sukumar was seen driving off with Watanabe. Byomkesh and Ajit go to meet Watanabe saying they are part of Sukumar’s Spring Day campaign, but Watanabe realizes they are imposters. Watanabe sends another member of Sukumar’s party to follow the duo. Byomkesh and Ajit, realizing they are being followed, change their attires and then follow the young man back to Watanabe’s office. Realizing the duo have outsmarted him, Watanabe murders the follower and his receptionist and escapes from there.
Byomkesh takes a paper out from the follower’s corpse’s pocket, which contains a drawing Byomkesh realizes he has seen before. Meanwhile, Dr. Guha returns to the lodging house and meets Byomkesh and Ajit, admitting that he committed the murders as he and Sukumar are working in cahoots to fight for the country’s freedom, saying Bhuvan Babu and Sikdaar were killed for being traitors. Upon returning to their room, Ajit begins venting about his father and the latter’s overcritical treatment of Ajit, during which he reveals Bhuvan Babu had lost a job at Hind Chemicals when they realized that his master formula had contained opium, used to addict customers. Byomkesh then tries Bhuvan Babu’s Paan masala, which Ashwini Babu appears to be addicted to, and in a state of euphoria, creates a wall-painting of his understanding of the entire case, saying Sikdaar had said the words “Young Gun” in Byomkesh’s ear just before dying. Byomkesh has the paan and his own blood tested; while his blood has traces of heroin, the paan is clear, and he deduces that the heroin was made by Bhuvan Babu with the property of not being traceable until it has been consumed. Byomkesh learns from Kanai Dao that the opium supply in the local areas has been halted, and asks him if he can help Byomkesh meet any heroin suppliers. However, Kanai turns out to be a police informer and turns Byomkesh and Ajit into Deputy Commissioner Wilkie. Wilkie reveals to Byomkesh about the Green Gang and their enmity with one of their former members Yang Guang, who wanted Calcutta’s opium business for himself and was killed by the Green Gang but has recently been touted to be alive. Byomkesh realizes Sikdaar had said Yang Guang, not Young Gun.
Byomkesh then realizes the drawing he had found is an outline of the Ganga on the Calcutta map and the set of points where the Spring Day campaign is to take place. With Kanai’s help, Byomkesh meets with the Green Gang, who help him deduce that Yang Guang has set a deal with the Japanese, who will attack Calcutta at the Spring Day campaign points and take over Calcutta, and in turn will gain control over the opium trade in the city. Byomkesh also realizes that Anguri Devi is Yang Guang’s lover, who she has not met in 4 years, who on Yang Guang’s orders, had killed Sikdaar and attempted to seduce Byomkesh, all along being in the dark about Yang Guang’s deal with the Japanese. Byomkesh meets Wilkie and requests him to set off all the Air Raid Sirens at 4 AM on the morning of the Spring Day campaign. Wilkie refuses and Kanai defects to Byomkesh’s side, as the latter saved his life from the Green Gang.
Byomkesh requests Dr. Guha, Satyavati, Sukumar and Dr. Watanabe to meet him at his house, saying he wishes to save them. Byomkesh then tells them about Yang Guang and reveals they have all been betrayed, and as he lays out the facts of the case, reveals that Dr. Guha is, in fact, Yang Guang. Byomkesh reveals that he has already informed the authorities, who have deployed attack units at all the stations where the Japanese soldiers will land. Guang claims Byomkesh is bluffing and Anguri Devi attempts to dissuade him from helping the Japanese conquer Calcutta, but he says he loves her and lures her, stabbing her brutally. In a turn of events, the Air Raid Sirens are set off and Yang Guang realizes that Byomkesh was not bluffing. Byomkesh convinces Watanabe to stop the attack for the safety of his men, who leaves to stop the attack. The Green Gang, who were present in the house all along with Kanai’s help, attack Guang as Byomkesh informs a panicking Satyavati that he was indeed bluffing, before being struck unconscious by a member of the gang. Byomkesh gains consciousnesses 2 hours later and is told by Ajit that the Green Gang has taken Yang Guang. Byomkesh asks Satyavati to marry him, to which she smiles in reply. Meanwhile, the Green Gang’s blinded leader is seen ordering his son to blind Guang, who then attacks the Gang and kills them (including the leader,s son whose knife he takes to blind himself) and vows revenge on Byomkesh by promising to give him hate. Soon Byomkesh realises something while Guang shouts in agony.
Sushant Singh Rajput as Byomkesh Bakshi
Anand Tiwari as Ajit Kumar Banerjee
Neeraj Kabi as Dr. Anukul Guha/Yang Guang
Divya Menon as Satyavati
Swastika Mukherjee as Anguri Devi
Meiyang Chang as Kanai Dao
Moumita Chakraborty as Leela
Mark Bennington as Deputy Commissioner Wilkie
Arindol Bagchi as Ashwini Babu
Aryann Bhowmik as Jai Bengal Party Boy
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 Watchman
Dr. Kaushik Ghosh as Gajanan Sikdaar
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
Kanwaljeet Singh Banga as Sikh Taxi Driver
Lauren Gottlieb (special appearance in the song “Calcutta Kiss”)