I agree with your comments about F E Campbell and have several of his novels. Kenneth Harding and A deGranamour are two names that spring to mind when considering past Masters of BDSM fiction. Also the late Victor Bruno was a substantial contributor to the genre, especially in the UK.

I have a book called Sentenced to Servitude Volume 1 by A deGranamour and I have been unable to trace the sequel Volume 2. The story is about a woman called Caroline Martin and if anyone is able to provide me with information which will help me obtain Volume 2 I would be obliged.

In addition, I especially like Ian Smith's novels of the current authors.