Guha, who admits he and Sukumar are working with the Japanese to free the country, with Sukumar to lead a 'Free Bengal', and murdered Bhuvan and Sikdaar for betraying them. The two enter his office and see their corpses Byomkesh finds a drawing in the volunteer's pocket. Discovering the ruse, Watanabe murders the volunteer and his receptionist before escaping. Having observed this, Byomkesh disguises himself and Ajit before following the volunteer back to Watanabe's office. Byomkesh and Ajit go to meet Watanabe, saying they are volunteers for Sukumar's Basant Panchami agitation, but Watanabe sees through them and sends a real volunteer to tail them. Byomkesh finds the cab Sukumar was last seen in, and the driver directs him to the office of Dr. Satyavati, Sukumar's sister, pleads with Byomkesh to help her brother, who she believes is innocent and in hiding. Guha leaves Calcutta temporarily but sends Byomkesh a stamp, confirming he had faked the letters and killed Bhuvan. Suspicion falls on Sukumar, who was seen making death threats to Sikdaar. Gently rebuffing her, he goes to meet Sikdaar, who immediately has a fit and passes away, having been poisoned. Byomkesh follows him home but is stopped by Anguri Devi, who attempts to seduce him.

However, Byomkesh discovers the letters are falsely backdated and saves Sikdaar from being framed. Guha return to the factory and find Bhuvan's body in a machine, causing Deputy Commissioner Wilkie to question Sikdaar.

Byomkesh visits Sikdaar's residence, where Sikdaar's nephew Sukumar is splitting the party and leading a new one, but is thrown out.īyomkesh and Dr. Noticing her hiding her purse, Byomkesh secretly goes through it and finds a set of letters containing words cut out from the newspaper sent to Sikdaar, deducing he killed Bhuvan for blackmailing him. Byomkesh visits the closed chemical factory where Bhuvan used to work, where he meets an actress, Anguri Devi, the wife of the factory's owner, Gajanan Sikdaar. He finds Bhuvan's paan box with Ashwini Babu, Bhuvan's roommate, and deduces that he was murdered. Anukul Guha, and takes a room to investigate. The following day, he visits the lodging house Bhuvan resided in, run by physician Dr. Byomkesh initially rejects the request but decides to check it out after his lover marries someone else. Meanwhile, Ajit Kumar Banerjee approaches Byomkesh Bakshi so he can find his missing father Bhuvan Banerjee. Three months later, the leader decides to return to Calcutta to investigate their missing opium.

In November 1942, shortly after the Japanese take over Burma, a group of Chinese men from the Green Gang are unloading opium in Calcutta but get ambushed, with their leader being brutally blinded by a mysterious figure.

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