This is a really deep read for anyone. While a lot of people are critical of Nietzsche's works, he still is a unique writer who has delved into the darkness of mankind's soul and found that there is a lot of evil in there.
The second part of this book deals with Nietzsche own life and self-interpretations on what he's wrote as a sort of overall view at the end of his life/career. Nietzsche while he's listed as a philosopher had rather unique insight into the world of psychology. He will always be treated as an outsider by the Psychology community because he studied the evil that is in mankind's nature and realized things long before others did. He was viewed as a raving nut later on in life, but this was due to staring into the abyss for too long, eventually the abyss will stare back into you.