The Demon Lover (Chivers Sound Library) (1982)

When Kate Collison, to help her ailing father, completes his portrait of the powerful Baron de Centeville, her only thought is to be a dutiful daughter. But when the Baron presents her to Parisian society as the painter, Kate finds herself basking in the recognition . . . until she discovers that the Baron has plans for her -- shocking plans that will change her life unless she can fight the Baron with his own weapons . . .