In 1917, two girls from a village in England claimed to have seen fairies and, to prove it, presented photographs that caused such a shock that, from that moment on, numerous experts and specialists used them to defend their theories. One of those who most vehemently considered was Arthur Conan Doyle, then already known for his police novels, who set out, as an inspector in routine cases, to gather evidence to document the case. Of course Conan Doyle wanted to provide the general public with evidence for fairies. The writer who, after the tragic death of several of his relatives, had abandoned Catholicism to become confessed to spiritualism, gathered all possible testimonies, from letters, photos, statements of people and theosophical theories, to show the reader the evidence of a phenomenon without a doubt surprising. That this extraordinary phenomenon could be captured through the technology provided by the camera, was something that confirmed the power of science, so defended by theorists and practitioners of various religions and alternative conceptions. This delicious book not only presents evidence of the existence of fairies, but establishes, based on objective evidence, as Conan Doyle calls his interviewees, a whole typology of wonderful beings.