The Caverns of Falkenhorst — Dorine Moore

Falkenhorst Castle loomed massive and foreboding before Marion Emory's eyes. Hidden in the gathering fog, it perched on a desolate stretch of craggy rock, its turrets and slitted windows emitting a curious gleam. Marion shivered in horror at the thought of her father, hidden somewhere within its halls. A sensitive artist, David Emory had come to work and rest. Surely nothing could be amiss.

But Marion knew she was an interloper here - and one glance at the coldly hostile faces of the von Rohn family left no doubt that she was unwanted as well. It was a place of unease...until the piercing, anguished screams in the night began, and Marion knew she was in a house of depthless terror and danger.