Professor Voronov finds himself in a rather strange bind. The novel of the classic Spanish literature Cervantes literally comes to life before his eyes. In Moscow, a real epidemic of imitative self-harm begins. Following the famous author of detective stories by the name of Gruzinchik, the world of show business was seized with a passion to publicly inflict terrible injuries on itself in order to further capture the attention of a jaded public, to charm it with so-called sacred violence. All the more or less famous people as one begin to cut off their right hand. The fact is that Cervantes was also deprived of an arm and in this state took up writing a great novel. And only Professor Voronov sees this as a sign. The long-forgotten book seemed to be taking on new life. It becomes a matrix book, capable of generating countless other texts, and at the same time blowing up the entire well-fed world of unscrupulous profit. It seems that the Knight of the Sad Image is about to appear to the world and punish all the sins of the world in his revolutionary impulse! But does the world need new upheavals, new messiahs?.. One thing is clear: somewhere in Spain, this revived Book, like a vampire, rises from the grave of oblivion and demands new victims. A professor with a fashionable best-selling author, a Georgian writer, goes on a dangerous journey to the homeland of Cervantes. What will come of it, will it be possible to stop the obsession? Everyone who reads the novel 'The Mystery of Medieval Texts' to the end will know...