Roti made in the early 1940s inspired by the German Expressionism, is a real critique of Indian society with prophetic insight. It deals with two models - one of a millionaire, possessed by money and power in an industrial civilisation, the other of a tribal couple living in a primeval state of nature. The millionaire is saved by the couple after an air crash, the tribal couple emigrate to the city, do not find happiness and return. The millionaire is ruined in the city, tries futilely to find salvation among the tribal.
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.
Devdas, the son of a zamindar, and Parvati, his neighbour's daughter, are childhood sweethearts. However, class and caste differences prevent their marriage. Devdas is sent off to Calcutta, while Paro is married off to an aged rich widower. In Calcutta, as remorse drives him to alcohol, Devdas meets Chandramukhi, a tawaif.