I am an adult child of a narcissist (ACON). Raised in the crucible of malignant narcissism I have a very personal understanding of Narcissistic Personality Disorder. There is hope beyond the narcissist for the victims of narcissists of which I'm living proof.
"No life is ever a complete failure; it can always serve as a bad example." At least a narcissist is good for something.
How do you determine if you are in a relationship with a person who is seriously affected by NPD? The signs are there for you to read; you need look no further than how you're being affected. NPD -- Recognizing the Problem.