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.

The trio of Feluda, Jatayu, and Tapesh have been invited to Panihati to investigate the case of Jahangir's missing gold coin. The client, Shankar Prasad Mitra, had a collection of 12 gold coins but on his last birthday, one of them was stolen by one of his most trusted invites. He invites the same group this year and asks Feluda to catch the culprit while hiding his true identity.

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.

2010 film by Sandip Ray