A British administrator with a flair for game hunting develops a friendship with a commoner who is an expert archer in an Indian village. The movie portrays the relationship between the British colonialists, and native villagers who were exploited by Indian landlords in 1920s India. This happens against the backdrop of the awakening of the Indian people against the British rule.

Famous Bengali private investigator Pradosh C. Mitter (Feluda) is hired by wealthy businessman Dinnanath Lahiri. His suitcase has been accidentally exchanged with someone on the Kalka Mail. Inside it is a valuable manuscript written by Shambucharan Bose. The case takes Feluda, Topshe and Jatayu to Shimla, where they discover a priceless diamond in a film container, disguised as a betel - nut. 'The Three Musketeers' face great danger in Shimla, before Feluda eventually solves the case.

Uma, a mute Brahmin girl, lives with her uncle's family as she is an orphan. Since Uma has a faulty horoscope which indicate widowhood, the family finds it impossible to get her married off. According to a custom prevalent at the time, Uma is given in marriage to a tree.

The sole dream of Ramu, eldest son a family of migrants, and Uma to build a happy life together is burdened by a pile of obstacles on their way due to economic upheaval in post-partition Calcutta.