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.
Famous detective Feluda meets Som, who tells him about a notorious drug ring in Kathmandu. When Som is found murdered soon after, Feluda, along with Jatayu and Topshe, sets out to catch the culprits.
Feluda is called to Gosaipur by Jiban Mallick, the son of the local Zamindar Shyamlal Mallick to investigate a threat of his father's life. Everyone in the village knows that father and the son are at loggerheads. Shyamlal is also an eccentric who eschews anything modern. Then, instead of Syamlal, his son Jiban Mallick is killed and the wealth of Mallick's looted. Oddly though, the dead body of Jiban Mallick vanishes, only to reappear again. Feluda works this out with a mixture of investigating skills and deception.
While at a felicitation ceremony, Feluda, a detective, meets Joychand, a simple man who owns a pink diamond. When several buyers set their eyes on the precious stone, Feluda must save the day.
On her way home the newlywed Romita is molested by five men. The only one who has the courage to help is the young female teacher Jhinuk. Because of that she becomes a heroine and is on all papers' front page. But the page is turning: As not only the police but also Neighbours begin to ask embarrassing questions the two women are eventually intimidated and the five men are getting free with the help of corruption and male domination.
An actress mysteriously dies after the "Shubho Mahurat," a celebration of the first shot of the film. A journalist and her perceptive aunt investigate.
