Maxim Serov finds himself in the Stone Age of a parallel universe straight from the deck of the International Space Station. He adapts, finds the first people, founds a settlement, and by uniting three tribes creates a powerful tribe of Rus. The Rus repel the rapid attack of a strong enemy: a large horde of savages migrating from Africa to Europe. Maxim focuses on improving the everyday life of his tribe, using the knowledge of a 21st-century human. Life starts to get better, but then a World War II military plane lands near the settlement of Plazh.
Americans! Friends or enemies? And what else awaits our hero on the path of organizing the first state of the Stone Age?