Detective Byomkesh and sidekick Awjeet, on the request of Dr. Rakshit, meets Bishupal, a moneylender whose life is under threat from Awbhoy Ghoshal. However, Ghoshal is found dead in a twist of events.

An expensive diamond necklace worth Rs. 57,000 gets stolen from Jeweller Roshomoye Sarkar's house by his servant Bholanath the night before its delivery to Delhi. Byomkesh investigates.

Byomkesh is invited by a police officer to help him investigate a most spooky mystery. A house has been the source of trouble for its current and former resident. Baikuntha Das, the original inhabitant of the house was a goldsmith, he had 51 precious jewels in his possession which he kept somewhere hidden in the house. The poor goldsmith was brutally murdered and the jewels stolen, now the current resident, Kailashbabu, claims that the ghost of Baikuntha Das is haunting him. Byomkesh and Awjeet dismiss this as the ravings of a neurotic and decide to pay him a visit, but then the duo discover first hand that Kailashbabu might not be lying.

Natabar Naskar is murdered. Byomkesh and Awjeet investigate.