A presence in the darkness: Library of America "fantastic" fiction anthology

Started reading the Library of America tales of terror and fantasy, first of two volumes. Who doesn't like LofA - those great high-quality editions, collecting some of the best American writing ever, and being willing to take some risks and chances and move into the odd corners of the American attic, as with this particular set. Horror/fantasy not totally my thing, but I have some confidence that there will be some gems in this set. Only read the first story, Somnambulist, by Charles Brockden Brown, one of those names I have heard often but not sure I've read anything by him. And I kinda see why. Somnambulist is a curiosity, by no means great writing or great literature, but as a piece from about 1810 it appropriately stands at the head of the list, even though it's not the best - like Beowolf leading off an English Lit survey, I guess. And it does seem to be written in another language, or at least by a writer who hates ordinary speech and has immersed himself in a Thesaurus. I think the pseudo-literary syntax is meant to make the story seem more substantial, literary, of a higher order - what pulp writer would have such a vocabulary? Story narrated by the apparent perpetrator of a murder that he himself wants to prevent - but he's the title somnambulist and cannot control his nighttime behavior. This is obviously one of the ancestral tropes of horror fiction: the zombie, the dual personality, the possessed. Strength of the story is the rather creepy description of the nighttime journey by post when the girl and her father sense a presence out in the darkness but never get a clear glimpse of him. Should they continue on with the journey? Would make a pretty good film, I think!