Speculum Mortis

Speculum Mortis (Latin for "mirror of death") is a horror-themed first-person point-and-click adventure done mostly in greyscale.

You are driving home from work on a dark and stormy night. You are very tired, and badly in need of some rest, when you suddenly spot a hitch-hiker on the road. The poor girl is soaking wet, so you decide to take pity on her, and ask her where she is headed. The girl doesn't say a word, and gives you directions by pointing. When you eventually reach her destination, you find that she has mysteriously vanished. If that's not bad enough, the gate to the mansion is locked behind you, so you are trapped!