American science fiction writer O. Kline reminds that the victory of human genius can result in unexpected troubles. Using his exceptional ability for telepathy, Dr. Morgan managed to send earthling Frank Boyd (“Warrior of Mars”) to Mars. However, the scientist does not suspect that he has entrusted such an important mission to an inveterate criminal and a cruel dictator. Jerry, Morgan’s nephew, the first earthling to physically travel through space to the treasured planet (“Outlaws of Mars”) was also unlucky. Representatives of the black race of Mars are rebelling against the emperor, and the white “alien” Jerry is perfect for sacrifice. Scientist Ted Dustin puts all the power of his mind into creating a cannon, the projectile of which can reach the Moon (“Maiza, Princess of the Moon”). When the project of the century is completed, earthlings receive from the satellite... counter salvos. True, the inventor of the ill-fated rocket had no idea about the existence of life on the Moon. However, the conflict is growing so rapidly that it is too late to make excuses. We must act...