Dark is a good description of Hell House, Ratsy. Without being gory -- at least, I don't think it is; other standards may be sterner -- it is dark because of the claustrophobic situation and how the characters, particularly Ben, are so deeply affected by it. The first time I read it, I was somewhat put off; the second time, a few years ago, I was rather more impressed by how Matheson dealt with the darkness and the way it reflected on his characters.
More on topic: I started Dark Entries, a story collection, but like other Robert Aickman collections I've started I find myself distanced, having to work to stay involved. When Aickman grabs me -- "The Hospice"; "The Inner Room"; "The Fetch"; "The Visiting Star" -- the distancing doesn't matter, but the opening story, "The School Friend," feels like a story better re-read than read. And, no, I can't really explain that much better. I've set the book aside to see if a later mood change makes the collection more approachable.
Ditto Bernard Capes' The Black Reaper, a collection of older ghost stories, that is demanding a level of attention I'm not up to right now for a sentence level extraction of meaning from oddly deployed vocabulary.
And so to Kim Newman's Anno Dracula 1899 and Other Stories. The first, "Famous Monsters," is relatively undemanding at a time when undemanding seems to be what I'm most up for, while still clever enough to appeal to me. What if the War of the Worlds had happened, maybe a couple of times, and Earth won? What happens to Martian immigrants? A frequently funny story first published just shy of 30 years ago, it remains timely in an uncomfortable way.
Randy M.