Seminal work to my understanding of the development of PD's and what I was dealing with. Game-changer.
My brief and unenlightened take:
Most "normals" see that they did 'a bad thing', PD's believe they are the bad thing (that they did). Crucial difference.
I did not read the rest of the book. It's free online iirc, that's all I needed.
Literally launched me toward healing...