The first volume of the adventure saga “Progressors”. The life of a modest labor teacher changes irrevocably after he, along with several young friends from an orphanage, discovers a mysterious something in the forest that opens a temporary passage to the Stone Age. To leave so as not to return... Try to direct humanity to a different path of development... Making a conscious choice, the heroes know that their path will henceforth be filled with hard work and unknown dangers. But the edge of untouched spaces calls with unexplored secrets and beckons with a thousand possibilities, and the fascinating process of building a new society changes not only the world around us, but also the heroes themselves.