The Dark Times of Ivan the Terrible. Several of our contemporaries who have fallen into the past - engineers, officers, teachers, with the help of mercenaries capture East Prussia, where they create their own state and frantically try to survive in the Middle Ages, in a whirlwind of religious wars. But no one likes such neighbors, the German principality states, Poland, England, France, Turkey and even Zaporizhzhya Cossacks - everyone strives to destroy incomprehensible neighbors. Ahead of war, intrigue and a great desire to survive, to save the lives of their children and their small state. Will they succeed?