About the book: year / After many, many years, a stellar expedition to the Zeta planets on the Helios spacecraft returned to its homeland. The crew of the ship was landed on the Moon, brought to the village of Luna I and kept in captivity. It turns out that over the past years a social catastrophe has occurred on Earth and human society has divided into two branches. One - a dead end - remained on Earth, and the second flew to the Moon in the hope of preserving human civilization, waiting until the earthlings exterminated themselves - and then returning. But the astronauts decided to figure it out on their own..