When historian Ishaan Chandra Majumder comes to the Jankigarh estate following the trail of an ancient treasure, a series of eerie occurrences starts happening in the fortress.

Byomkesh insists on staying at the fortress to decipher the clues left behind by Ishaan Chandra. As he delves deeper, he unveils a series of intricate puzzles.

As Byomkesh becomes suspicious over the death of Ram Vinod, he unravels a complex maze of secretive relationships that guard the layers of mysteries within the enchanted fortress.

Amid Byomkesh's quest for truth, Satyabati's sudden appearance surprises everyone. Things take a sharp turn when Satyabati unknowingly discovers a secret tunnel.

When Byomkesh and Ajit interact with the mysterious ascetic in the jungle, they stumble upon a gruesome truth. Will it unravel the perpetrator hiding in the depths of the fortress?