Hidden within the misty, haunting landscapes of Kalimpong lies Pine Villa, a grand estate shrouded in secrets. When a priceless blue diamond locket vanishes from a safe that remains miraculously locked and intact, the quiet lives of the Chatterjee family are shattered.The only trace left behind is a single, dried blue Aparajita flower—a silent witness to a tragedy buried for over a decade. Enter Detective Durjoy Bhattacharya, a master observer of human nature, accompanied by his tech-savvy nephew, Bishu, and their companion, the writer Abinash. As they peel back the layers of deception within the villa, they discover that every servant and resident harbours a motive, and the line between mechanical brilliance and dark history begins to blur.In this chilling "e;locked-room"e; mystery, the team must race against time to uncover the truth before the fog consumes the house and its secrets forever.