The Necromancer by Lorenz Flammenberg

In Jane Austen's Northanger Abbey the central character, Catherine Morland, has read too many Gothic novels, and under their influence imagines the abbey to conceal lurid secrets. She discusses them with her friend:

"Dear creature! how much I am obliged to you; and when you have finished Udolpho, we will read The Italian together; and I have made out a list of ten or twelve more of the same kind for you."
"Have you, indeed! How glad I am! - What are they all?"
"I will read you their names directly; here they are, in my pocket-book. Castle of Wolfenbach, Clermont, Mysterious Warnings, Necromancer of the Black Forest, Midnight Bell, Orphan of the Rhine, and Horrid Mysteries. Those will last us some time."
"Yes, pretty well; but are they all horrid, are you sure they are all horrid?"
"Yes, quite sure; for a particular friend of mine, a Miss Andrews, a sweet girl, one of the sweetest creatures in the world, has read every one of them."
Here we have The Necromancer, treacked down by Nina Zumel