Note: Possibly a genre novel, based on the publisher's description. Verifier should check, and update the author's bibliographic comments as appropriate.

Synopsis: Publisher: Was it madness -- or the devil's own black curse? Lovely young Jenny Slade had come to the forbidding castle on a mission of mercy, leaving behind the man she loved. Jenny knew she would wait for Ted, but the wealthy and handsome Lew Warren and her wild, maniacal patient, his father, made her waiting into a nightmare. Then the old man died, unleashing the demon who had racked his mind, body and soul. Now this hideous thing sought to claim Jenny. Had she the power to resist -- or was she doomed to become its evil thrall?