Book excerpt: This relatively short book is widely regarded as the best on the apparition of Our Lady in 1531 in Mexico City. Tells the complete story, from the Conquest of Mexico and the conversion of the Aztecs, through the development of the devotion and into the modern era. Shows that the picture is not a painting, but more like a photograph, and how under normal circumstances it should have disintegrated in 20 or 30 years. Describes several miracles that saved it and the remarkable power of the devotion. An enthralling story and an essential devotion.