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 the whirlwind of religious wars. But no one likes such neighbors; the German principalities, Poland, England, France, Turkey and even the Zaporozhye Cossacks - all strive to destroy their incomprehensible neighbors. There are wars, intrigues and a great desire to survive, to save the lives of your children and your small state. Will they succeed?