Feluda (Abir Chatterjee) and his cousin Topshe (Sourav Das) visit Lucknow with Topshe's father (Deepankar De) to spend the Puja vacation. They arrive at the house of Dhirendra Kumar Sanyal (Biswajit Chakraborty), a friend of Topshe's father. That evening Dr. Shrivastav (Bharat Kaul) also comes to Dhirendra Kumar Sanyal and tells him that last night, a thief tried to steal his 'Ring of Aurangzeb' (The Emperor's Ring) which was given to him by Pyarilaal Seth. After the incident Dr. Shrivastav is afraid and asks Dhirendra Kumar Sanyal to keep the ring safe. Sanyal agrees and keeps the ring at his home. But one day the ring goes missing from there. Then Feluda and Topshe start investigating, to find the culprit.