Curiously enough in the last two nights I suffered from a ferocious attack of insomnia, and so I grabbed the first book on my bedside table and started reading. The book is The Vampire Genevieve omnibus, by Kim Newman writing as Jack Yeovil, to me still the best RPG tie-in book aver, and a great example of horror/sword & sorcery crossover.
The first novel in the omnibus is, of course, Drachenfels.

And here is a lengthy interview with Kim Newman about the novel, and what he was intending to do when he wrote it – the influences, the twists and everything else.
Quite interesting.