A man mistakenly invites a family, whose girl was (and is still) betrothed to the groom. It was he who set up the cousin's alliance, would the girl forgive him, whom he had fallen in love? How to prevent her from attending the marriage?

The story revolves around a retired judge, Mr. Nishanath Sen, who stays at a farm house called Golap Colony (The Rose Colony) at the outskirts of Calcutta. The people who stay in the colony are a strange melee of handicaps, social outcasts and ex-convicts. One day the judge is murdered under mysterious circumstances. The local police assign Byomkesh to the investigation. As a close acquaintance of Sen, Byomkesh is more than willing to solve the murder mystery. Through many twists and turns in the story, he goes on to solve the mystery.

A wandering baba initiates a widower layer and his youngest daughter, irritating her boyfriend Satya and the ever-skeptical Nibaran.