Sona da with Jhinuk and Aabir embarks on his new adventure, a quest which will take them into the Durgeshgor that is legendary. The journey reveals that the secret is held by the zamindars in their princely mansion, the Debroy family to a rumour of a treasure attached with Plassey. By having an awesome vibrant backdrop of Durga Puja from the princely Debroy mansion at which the trio is invited for that occasion, one after the other clues is shown analyzing Sona da's humor and grit one more time contributing to the discovery of among biggest prizes Bengal has witnessed.