I’d read anything Marina Warner cared to write about. The monster as moral compass? Here she is in the TLS writing about Monsters, Magic and Miracles:
Monsters demonstrate, monsters alert us: whether or not the etymologies relating the word to both “monstro” (I show) and “moneo” (I warn), are correct, monsters act as a moral compass. The physical prodigy becomes a test of ethics and, in the move between literal and figurative, displays the crucial role fictions play in the establishment of value and the common sense. Or, one might say in the era when the Humanities are under such stress, thinking with monsters shows how an understanding of Nature, and of medicine, law and custom is impossible without cultural expression.
