The family's struggle to survive and adapt to the changing environment and technological advancements over time. The book is written by a Russian author, and it explores themes such as the importance of understanding the process of technological evolution, the need for a personal paradigm for perceiving the development of modern knowledge, and the survival of humanity in a world torn apart by conflict. The story takes place on a distant planet where the only source of energy is a rare mineral called "green moonstone", which the family must use to survive. As the generations pass, they must adapt to new technologies and environmental changes, all while trying to maintain their way of life. The main character, Ivan, is a young man who discovers a hidden underground city filled with ancient technology that has been lost for centuries. He must navigate this new world and learn how to use the technology to save his family and community from destruction. Along the way, he learns about the history of the planet and the people who once lived there, and he realizes that the key to survival lies in understanding the process of technological evolution and developing a personal paradigm for perceiving the development of modern knowledge.

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