The film is a melodrama with scientific speculation. Helius (Willy Fritsch) is an entrepreneur with an interest in space travel. He seeks out Professor Mannfeldt (Klaus Pohl (actor)), a visionary who has written a treatise on the likelihood of finding gold on the moon, only to be ridiculed by his peers. Helius recognizes the value of Mannfeldt's work. However, a gang of evil businessmen have also taken an interest in Mannfeldt's theories, and send a spy (Fritz Rasp) (identified as "The man who calls himself Walter Turner"in the opening credits) to make sure they get a piece of the action.