Bouvan disappeared mysteriously, and the son found Bakshi and asked him to help him find the trace of his father, but the son knew nothing of his father's whereabouts, only that his father was a chemist. Bakshi comes to the place where Bhuwan disappeared. Dr. Guha is the owner of the apartment, and learns from Bhuwan's former roommate Asiwi that Bhuwan was murdered. Bakshi found Sidal's factory following Bouwan's work, and found a threatening letter, thinking that Bowan was trying to intimidate Sidal. But the fact is that Sidal is not the murderer. This threatening letter is forged. I thought it would end the case, but found that the case is far more than the surface.
Sidhar, a member of the Bangladeshi political party, whose nephew and uncle disagreed politically. The nephew had a deep relationship with the Japanese, and Bakshi followed it and found out that Dr. Guha was Yang Guang, and Yang Guang cooperated with the Japanese for his own business. The Japanese wanted to open the gates of Calcutta with drugs, but were cracked by Bakshi.
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