Subarna Sen (Sonada) (Abir Chatterjee) is a history professor at Oxford University. After teaching abroad for several years, when he returns to India, Sonada meets his nephew Abir (Arjun Chakraborty) and Jhinuk (Isha Saha), Abir's best friend. Abir took Sonada to their ancestral home in the village of Manikantapur, where Abir’s eccentric but erudite maternal uncle Harinarayan Singha Roy (Goutam Ghose) had died recently under some mysterious circumstances. Visiting that place, they come to know about the 350-year-old Mughal treasure of emperor Shah Jahan's second son, Prince Shuja, hidden somewhere in that palace. Before his death, Singha Roy had left a clue in his diary to help Abir locate the treasure. Meanwhile, they discover that the local promoter and soon-to-be election candidate Dashanan Da (Rajatabha Dutta) also knows about the treasure and is trying to steal it.<ref name="auto"/>