Summary Calcutta, 1968. Beni Madhav (Daji Bhatwadekar) is a rich man, who is very sick. He feels that his son and daughter want to see him dead, so that they can take over his property. Due to his fears of being poisoned via food, Beni starts to arrange for his own food. Beni asks his faithful servant, Meghraj to bring his wife Phoolvati so that she can cook Beni's meals. Meghraj even shaves Beni on a daily basis.

Beni gets better and calls his lawyer Sudhanshu. He has everyone in the meeting, his daughter Gayatri (Pushpa Verma), her husband Gangadhar (Indrajeet Sachdev), their daughter Jhilli (Piyali Mukherjee). His eldest son Ajay (Mannjit Singh) & wife Aarthi & their son Makrand (Ashiesh Roy) & daughter Rauni.

Two other boys stay in the house, brothers Sanat (Naved Aslam) and Nikhil (Anup Soni) who are Beni's mama's sons. Beni instructs the lawyer that Gayathri and Ajay will continue to receive monthly allowances, but no cash balances. He has kept aside Rs 50,000 each for Jhilli, Rauni and Makrand for their wedding. He offers to pay for Makrand's education but asks him to mend his vagrant ways. Makrand leaves the meeting in disgust. Beni declares that he will put a condition in his will that if his death is not natural then no-one gets anything. In that event everything will go to Calcutta University. Sudhanshu leaves with instructions to come back in 2 days with the will and witnesses.

The next morning Beni & Meghraj are found dead with their throats slashed. No one entered the room as Meghraj was sleeping just outside. The previous night, Makrand came at 9 pm and left before midnight. Sanath went away out of town to return the next day. Nikhil was not in house. Gangadhar came home drunk & hit shamelessly on Phoolvati. Rauni went out for movies with her boyfriend. Murders took place between midnight and 3 am. Makran is missing and an arrest warrant has been issued against him. Makrand is arrested at a gambling den and is arrogant as ever. He refuses to answer any questions.

Nikhil claims to Byomkesh that he goes to parties at night to figure out which girl wrote him a love letter. Sanat tells Byomkesh that he has no proof that he went out of town on the night of Beni's murder. Gayatri is quite adamant that there is no will from Beni before his death. Byomkesh suggests that maybe in that will Gayatri was disbarred from all of Beni's wealth. Gayatri is very angry at Byomkesh. Byomkesh collects all raincoats from the house. He theorizes that the killer would have worn a raincoat to avoid the fountain of blood from slashing the throats, splattering of his or her clothes. Blood can be easily washed off a raincoat.

Byomkesh reveals that he found the blade which Meghraj used to make Beni's beard. But the blade was blunt and had no fingerprints on it. This suggests that the blade was used to kill Beni & Meghraj. Plus, the blade was in Beni's room and Meghraj was sleeping outside the room. So how did anyone acquire the blade?

Byomkesh then reveals that his investigations show that Phoolvati was not Meghraj's wife. She had left her real husband and ran away with Meghraj. Once here, she fell in love with another man & hence decided to remove Meghraj from the picture. But killing Meghraj would have led to suspicion, so it was agreed to kill Beni as well to complicate the investigation. Byomkesh reveals that it was Sanat who was Phoolvati's lover & killed Meghraj as well as Beni. A few drops of blood was found in the pocket of Sanat's raincoat, which led to his arrest. Jhilli had been writing the love letters to Nikhil as her fingerprints were found on the letters she wrote.

• Adventure
• Crime
• Mystery
• Thriller