We all come from childhood. The memory of him never lets go for a long time, from time to time scrolling before my eyes amazingly colorful pictures. A strange story told by a friend, also from that time. Exploration of a cave complex located in the Ural Mountains leads to the discovery of an incredible structure. Here, for millennia, the memory of the lost civilization of the Earth has been preserved. Having received answers to almost all questions and having learned how the past world died, the heroes understand that nothing is over yet and the end of time is a step away.