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.

Rahul agrees to marry Pallavi according to his father's wish but insists on a condition that the marriage will be a contractual one. However, things change when Rahul meets with an accident.