I just wanted to recommend this book by Lynn Fairweather. Its a relatively new book, published 2012, and for me anyway the best book I have read on this subject. She has worked for many years in this field, and it shows. It is especially good on how to escape an abusive relationship, very clear and intelligent about how to do this to ensure highest safety for the woman.
I was reminded of the book whilst watching "Living with my Stalker" last night on TV. It was an incredibly scary programme about a young doctor who developed a relationship with a man she met dating online who turned out to be a narcissistic psycopath, and how it turned her and her family's life upside down. I remember reading this book earlier on in the year and just wanted to recommend it really.