Thirty years ago, at a scientific conference, Prof. Manfeldt presented his theory on the existence of gold on the Moon. It was greeted with laughter by the assembled academics. Today, Herr Helius has ambitious plans to build a spaceship... and take it to the Moon! Windegger, his chief engineer, will be going, and so will Prof. Manfeldt, now living in a cramped garret alone with his theory. But there are disagreements with the financiers who insist that their man Turner also accompany the flight... The unmanned Rocket H 32 brings back valuable information from the dark side of the Moon. Helius is upset by the news of Windegger's engagement to the pretty Friede. And the financiers have a secret agenda: to control the world's gold supply... Finally, the Spaceship "Friede" is ready as it rolls out on its gantry for takeoff. The staged rocket works as planned, but the acceleration is fierce. As they approach the Moon, they discover a stowaway on board, Gustav, a little boy...