The book includes 130 articles on the main categories, motives and images of medieval Christian demonology. The story of the fallen angel, contrary to its seeming simplicity, appears here as a semblance of a grandiose architectural structure - a verbal labyrinth, where the antinomies of the demonological myth, its internal contradictions and paradoxes serve as intersections. The category-like construction recreated on the pages of the book is a work of art of its kind; she is as much a brainchild of medieval imagination as Gothic cathedrals, polyphonic music, chivalric romances and mystical visions. The main text is accompanied by color and black and white illustrations (over 100), a subject-nominal index, and a list of references.