The dizzying adventures of the hero of the trilogy of the popular American science fiction writer O. Kline began with an unusual advertisement in the newspaper. For new experiments with the transmigration of consciousness, Dr. Morgan needs a risk-taker. Robert Grendon, a not entirely prosperous young man consumed by boredom, decides to try his luck and soon finds himself in Morgan's laboratory. Stunned by the story of the daring scientist, Grendon agrees to transfer his consciousness into the body of a resident of Venus. And then he plunges into the thick of rapidly changing events, requiring considerable courage from him...