A huge alien ship parked behind the Moon. Raru, the son of King Enkaol, the ruler of one of the planets in the Cygnus constellation destroyed by the explosion, lives on a ship and dreams of Earth, the most beautiful planet of the Near Universe, where they have not yet forgotten how to feel and care for each other. He knows that his civilization can teach people a lot, but there are others on the ship - aggressive “violet” ones who need the Earth’s natural resources and new slaves. We urgently need to help my father retain power and defeat the purple ones. You need to find the Golden Disk, with which you can turn to the Higher Powers. The disc is a pass. The last time he was seen on Earth was at the beginning of the twentieth century in Russia. Three faithful, inseparable friends, Moscow schoolchildren living in the same yard in 1937, know how to find this disk and save the people of Rara. That is, they don’t know yet, but they are about to find out... And time travel is not a problem for Raru.