[Strangelet]

The Hell-Fire Clubs : sex, satanism and secret societies by Evelyn Lord.

probably the "definitive" book on the subject as she puts the work in required to say "this is what we know happened and this is what we speculate".

Catriona, by Robert Louis Stevenson. A sequal to Kidnapped! !!!!! who knew??!?!?! Get more Alan Breck for your fix!!! (because he really is the coolest character that came out of this genre)

Falling Angel by William Hjortsberg. Dood, get a pen name!!!.... Especially when you're writing such cracking good american style horror/hard boiled detective novels, where people like Raymond Chandler and Steven King envy your ideas (or should). And thanks for the manly pages of booze, cigs, brawls, and sex. i'm getting tired of all this secret lives of bees bullshit.