Ver en Cuevana. Using the moon’s rays, Professor Harnam invents a potion that turns man into a murderous beast. His brother Professor Vaman, realizing the dangers of this invention, realizes the urgent need of producing an antidote to avoid disaster. However, it is too late as Harnam’s daughter drinks the potion during a quarrel with her lover Detective Kishore and the city begins to witness a murder spree amongst its elite and wealthy citizens.