Titus Groan

Anyone who likes eerie, strange fiction should be sure to try the long series Titus Groan by Mervyn Peake. It is I think for people who liked Vonnegut, Poe and especially Henry James' Turn of the Screw. You need to enjoy Victorian horror, ie. Gothic fiction, to truly love this, the first in the Gormenghast series [which is the name of Titus' castle, also]. 

Some other Gothic horror fiction includes Walpole's 1763 The Castle of Otranto, Ann Radcliffe's 1794 The Mysteries of Udolpho, M.G. Lewis' 1796 The Monk and Clara Reeve's 1778 The Old English Baron. In France this genre was called the 'black novel' or roman noir. Here's a little excerpt:
[...]

The crumbling castle, looming among the mists, exhaled the season, and every cold stone breathed it out. The tortured trees by the dark lake burned and dripped, their leaves snatched by the wind were whirled in wild circles through the towers. The clouds mouldered as they lay coiled, or shifted themselves uneasily upon the stone skyfield, sending up wreathes that drifted through the turrets and swarmed up hidden walls.

[...]