In China, Professor Gesellius has completed his long research on the many uses of opium. When he is about to return home, he hears about a special variety that produces fabulous sensations because of the way it is made, but can also cause the total destruction of the mind and body of the person who consumes it.
The film tries to capture the "nervous epidemic" caused by war and misery which "drives people mad". This unique portrait of the life in 1919 Germany, filmed on location in Munich, describes the cases of different people from all levels of society: Factory owner Roloff, who loses his mind in view of catastrophies and social disturbances; teacher John, who is the hero of the masses; and Marja who turns into a radical revolutionary.
