While exploring the Tungkulung forest with Bapi and Promotho, Eken Babu stumbles upon the dead body of the local king, Shyamsunder Rana.

Eken meets Binoy Prodhan, the estate heir. Things turn suspicious when the late king's lawyer points out the recent changes in his will.

Everyone from the royal family joins Eken's list of suspects, followed by their inconsistent statements. Back in the police station, Eken finds out the motive behind the murder.

When Binoy discloses the menacing behaviour of Shyamsundar Rana's business partner, Shaibal Babu, it throws light on a new angle of the mystery.

Although police trace Binoy's phone location near the death spot, Eken discovers a deadly conspiracy rooted in decades-old secrets and a precious diamond's history.

When Eken Babu becomes determined to know more of Binoy's past, a startling revelation comes to the fore.

Eken Babu arrives at the royal palace to unmask the killer. But will he divulge the invaluable thing that the killer was craving?