Three hundred years have passed since the beginning of mankind’s space expansion. New planets inhabited by people are united by the possibility of hyperspatial travel. But there are Closed Worlds that are deprived of this, and among them is the ancestral home of humanity - the Old Earth. An experienced intelligence officer, Dick Simon, takes on the task of correcting this mistake. He has no equal in hand-to-hand combat, because he learned martial arts from the four-armed warriors of the planet Taiyahat. But on the Old Earth, which has become the focus of evil, even he has a hard time...