Spadework for a Palace bears the subtitle “Entering the Madness of Others” and offers an epigraph: “Reality is no obstacle.” Indeed. This high-octane obsessive rant vaults over all obstacles, fueled by the idées fixe of a “gray little librarian” with fallen arches whose name—mr herman melvill—is merely one of the coincidences binding him to his lodestar Herman Melville (“I too resided on East 26th Street . . . I, too, had worked for a while at the Customs Office”), which itse