The search for a valuable scroll leads Feluda and his friends to a strange cast of characters, and perhaps the most chilling case Feluda has ever been faced with. For among D.G. Sen, the collector of scrolls, his son Mahim, his secretary Nishith, the wildlife photographer Bilas Majumdar, and the astrologer Laxman Bhattacharya, there is a cold-blooded criminal, and he must be stopped before it is too late.