The murder of a stranger in a Calcutta hotel leads Feluda and his friends to Kathmandu, straight into the den of Maganlal Meghraj, their old adversary. With an incident at Swayambhunath, an ambush in a prayer wheel factory, a thrilling night at the casino, and a prolonged LSD-induced delusion for Jatayu, the case soon turns into a memorable adventure. In a sensational climax, the master sleuth uncovers an international racket in spurious drugs and emerges victorious yet again.