Didn’t an angel’s wing give the famous writer Krupenina-Inozemtseva a pen so lively that with it the flight of fancy is uncontrollable and dizzying? Or did the brilliant Yulia Solomonovna entrust her soul to the devil, give up quiet family happiness for the delights of creativity and commercial success, and that is why her children die one after another? The whole of St. Petersburg is discussing the tragedy of the life of a fashionable writer, while she herself rushes about, unable to understand the cause of her troubles. She says that an ominous Black Man appears to her, promises fiery hell... It is, of course, difficult to believe in this, especially for an experienced investigator who is completely alien to mystical moods, and therefore will look for the villain among the living, among those closest to him...