remains unfinished as Mr Sen is bludgeoned to death with a blunt weapon. Byomkesh and Ajit are visited the next day by a police inspector who wants their help on the murder Sen, not knowing of Byomkesh's pre-existing relations with Sen. Byomkesh and Ajit return to the colony and interrogate everyone concerned with Sen's nursery. After a thorough investigation, Byomkesh realises that the case will not prove easy to solve, as there are several motives and people behind Sen's death. After a few days, another murder occurred inside the Golap Colony: this time the victim is Panu, a deaf-mute and one of the suspects who witnessed Sen's murder. Panu's killer used the same weapon and method as was used to kill Sen. Byomkesh again reaches the spot, examines everything and decides to record the interrogations with his voice recorder. He interrogates all the suspects: Bijoy (Mr Sen's nephew), Rasiklal, Muskil Mian, Brajo Das (employees of Sen), Nepal Gupta (a professor) and Dr. Das (a physician and sitarist), and all the women, including Mrs Damayanti (Sen's widow), Mukul (Nepal's daughter) Nazar bibi (Muskil's wife) and Banalakshimi – one among the list of suspects. Byomkesh takes an old photograph of Sunayana and tries to match it with all the women under suspicion, but he is unable to make a match. Shortly after the latest round of interrogations, Brajo comes to Byomkesh's house and confesses about his lord's personal life. He says that Damayanti Sen was not Sen's legal wife but a live-in partner. Many years ago, Sen sentences Damayanti's husband Lal Singh to death for a criminal case. But Lal is not hanged, but rather imprisoned for 14 years because of the concession given from a high court. Lal later kills a person to steal his car. He takes parts of the car and throws them through Sen's bungalow window every fortnight to threaten him. Lal often visits Damayanti secretly for money. But Byomkesh's investigation reveals many other possibilities too. He finds a tape of Dr. Das playing his sitar in the doctor's room; this tape was played in the background during the murder of Sen (the tape was heard by Byomkesh through the phone). Byomkesh also finds that Bijoy abandoned Mukul for Banalaxmi. Byomkesh knows that Sen would not have agreed to the relationship of Bijoy with Banalaxmi, so there is a chance that Bijoy murdered Sen in order to marry