Summary Himangshu (Anang Desai) is a rich Landlord with a huge estate outside Calcutta. Byomkesh & Ajit are spending a few days there, courtesy their common friend Tridivendra Narayan (Devendra Khandelwal). Himangshu is an expert shooter and can shoot just by hearing sounds of his target. Himangshu had hired a poor, educated man, to be his daughter's (Rony Saha) tutor. The man, Harinath (Nirupam Bhattacharya) had joined Himanshu's employment 2 months ago. He was very straight, and humble. But the man has gone missing for 2 days.

Himangshu was embroiled in financial court cases with rivals. His estate's financial records for last 4 years are also missing and so are 6,000 rupees from his locker. Himangshu and his PA, Diwan Saheb Kaligati Bhattacharya (Krishnakant) feel that Harinath worked for their rivals and perpetrated this crime. Upon investigation, Byomkesh finds that Harinath wore a spectacle, but the same was found in his room. He also found Harinath's slippers and clothes in the room. Byomkesh finds it odd that Harinath left without his glasses and clothes and suspects that Harinath might be dead. Diwan Saheb specializes in making animal sounds.

Outside the estate is a quicksand, cleverly concealed with a cottage and very difficult to detect. The cottage was built by Diwan Saheb to host a Tantric who visited the estate a few years ago. After 6 months, the Tantric vanished, but the cottage remained. Diwan Saheb is convinced that Harinath is hiding in the cottage as he sees light coming from the cottage at night. Diwan Saheb advises Byomkesh to hide in the cottage the next day to catch the culprit and to run towards the sands, if they hear a tiger (as tigers don't go into sands). Byomkesh simply listens to Diwan Saheb and doesn't indicate that he already knows that the sands outside the cottage hide a quick sand area.

Without telling Diwan, Byomkesh tells Himangshu to come to the cottage at 10 pm, when they would go at 9 30 pm. At 9 30 pm, Diwan comes to see Byomkesh off. At 10 PM, Himangshu joins Byomkesh & Ajit at the cottage. They hear tiger sounds. Himangshu shoots & finds that Diwan is dead. When Himangshu's father died, Himangshu was not interested in being the landlord, so handed over the reins to Diwan Saheb, who got greedy and started stealing from the estate. As the greed grew, he mortgaged Himanshu's property to raise loans and then used the stolen money to buy the property from the loan sharks. He also initiated the court cases, to justify the higher expenses and to hide his theft.

Harinath was a simple man & got access to the ledgers and quickly found the theft. He reported the theft to Diwan Saheb, who got afraid that his time was up. He lured Harinath to the cottage and then used his tiger voice to scare Harinath into going into the sand, where he got consumed by the quick sands Diwan Saheb got scared by Byomkesh's investigations and lit the fire in the cottage himself to convince Byomkesh that Harinath was alive.

• Adventure
• Crime
• Mystery
• Thriller