This is a historical detective story from the time of the Mongol invasion. The book: about friendship and honor, meanness and betrayal, about feats of arms, love for the Motherland and women, about the dramatic destinies of people of that time. It describes the formation of Christianity in Rus' and the emergence of the Cossacks. The purpose of the book is to remind everyone about tolerance, that the same blood flows in our veins, the blood of our ancestors. Rus' is strong in Peace.