The adventures of Dima Drozdov continue; the descendant of a Vedic family has fallen into a lethargic haze, from which his loyal friends help him get out. In the fourth part of the novel, learning the wisdom of humanity and stumbling over the mistakes of his first love, Dima will undergo tests on the mysterious Mars. Space adventures are filled with unexpected discoveries: technologies of ancient civilizations, mythical inhabitants of the Red Planet, secrets of the Earth's satellite. Once again, the guys will show skill and get the fourth of the seven fragments of the heart of the Universe.