This may be old news to some, but I just stumbled across this Seattle PI review of this book. Just in case it might be of interest to you:
Help! I’m in Love With a Narcissist by Julia Sokol and Steven Carter.
The book looks like it is focused on romantic relationships with narcissists. A timely subject for our day. I haven't read this book myself, but if any of you have then please feel free to post in the comments your review of the book.