In this darkly satirical fiction debut, a harmless joke thrown in after one glass of wine too many triggers a chain of vengeful plots, grotesque confrontations, and literary hoaxes. World experts on Madoc, the great 18th-century poet, are assembling for a celebratory conference in Wales; the setting is an isolated building run by a religious sect advocating purity of mind. It's a gathering populated by shady, repressed, and unscrupulous academics,...