Tresch packs quite a lot into his book—there’s even an ingenious deconstruction of the title page of Poe’s nautical novel, the macabre and tantalizingly enigmatic 'Narrative of Arthur Gordon Pym of Nantucket.' Still, prospective readers of The Reason for the Darkness of the Night should be aware that it isn’t a sustained, detailed exposition of Poe’s life so much as a rich assemblage of biographical vignettes, brief story analyses and mini-essays on the era’s scientific beliefs. In general, Tresch’s overall thesis—that Poe’s 'deep familiarity with science was the fulcrum on which his thought balanced'—seems unarguable, given the presence of the 'ratiocinative' in so much of what he wrote. Yet, ultimately, it is Poe’s other aspect, his ability to convey monomaniacal intensity, verging on hysteria, that we are drawn to, his gift for expressing what D.H. Lawrence floridly called 'the prismatic ecstasy of heightened consciousness.'.