The Russian space captain, Prince Gagarin, intended to seduce the wife of the British Lord Roxton. But the lord himself was not delighted with this prospect. The matter almost ended in a duel. Fortunately, the daughter of Professor Bunny, who disappeared in the red jungle of an unknown planet, asked the duelists for help in time. And instead of shooting, Prince Gagarin and Lord Roxton go on a space expedition. From planet to planet, from one deadly adventure to another, step by step they approach not only the mystery of the disappearance of the professor, but also the greatest treasure in the solar system...