Occasionally a book like this gets through the discerning reviews of those who recommend it as Christians. Unfortunately, this book is not one that is written by a professional from his own professional perspectives. It is instead a book that is written from the author's personal experiences. This is not a good book for anyone seeking help from domestic abuse, someone who gas lights them, or for someone who is seeking information about a narcissist.
There are many professional books about narcissism and its effect on relationships. This is not one of them! It even offers terrible advice about leaving marriages instead of working through difficulties.