I finally managed to find a copy of Vathek by William Beckford, which Larry suggested as a read for me a good while ago, so I might read that, along with the other novels in the same volume (The Castle of Otranto by Horace Walpole and The Monk by Matthew Lewis, I'll pass on Mary Shelley's Frankenstein - the theme of the collection is old Gothic novels).

But I also still have Anthony Trollope's Phineas Redux, and I bought Carson McCullers' The Heart is a Lonely Hunter, so it might be any of those - or I might try and follow the Challenge and add an actual fantasy book to my "spec fic" and sci-fi.