The mid-14th century. The most monstrous catastrophe of the Middle Ages is coming for France—the Black Death, a great plague epidemic. But there is also another danger: mysterious and frightening events in the county of Artois, which the best investigator of the kingdom’s Inquisition has been assigned to study. The investigation unexpectedly gains the participation of a nobleman named Jean de Partenay, who insists that he was born in 1984 from the birth of Christ. Yet the head of the Inquisitorial Tribunal has no doubts about his words, knowing well about the phenomenon called “Doors,” “Holes,” or “Roads.” In the fourth novel of A. Martyanov’s cycle “The Heir,” the reader will meet familiar heroes again and take part in uncovering the most dangerous case, in which aristocratic intrigues, medieval sorcery, and big politics are intertwined.