In Blake's final notes, he refers to "Roderick Usher", an allusion to Edgar Allan Poe's "The Fall of the House of Usher", which Lovecraft described in "Supernatural Horror in Literature" as featuring "an abnormally linked trinity of entities...a brother, his twin sister, and their incredibly ancient house all sharing a single soul and meeting one common dissolution at the same moment." "An H. P. Lovecraft Encyclopedia" suggests that this interpretation is the key to understanding the ending of "The Haunter of the Dark": "e are to believe that the entity in the church--the Haunter of the Dark, described as an avatar of Nyarlathotep--has possessed Blake's mind but, at the moment of doing so, is struck by lightning and killed, and Blake dies as well."