His name is Sergei Vladimirovich Shatrov. One of those who escorts cargo for scientific expeditions. Albeit not quite ordinary, but far from romantic and fantastic plots. Regular work? Yes, if not for His Majesty Chance, which will turn our hero’s usual life upside down, throwing him into one of the parallel realities, where he will face not only the most difficult trials, but also mysteries that can turn the history of mankind upside down. How thin is the border between worlds? Who was the first to penetrate space? Who were they - just time travelers or some kind of super beings who created civilizations in the name of a goal unknown to us?