A very interesting book! The author has covered the topic better than the couple of books I've read to date on dark psychology. In particular, I've found the discussion on 'Principles of persuasion' and NLP to be the most memorable. The breath of the book, covering the topic so widely, is also a major positive.
I was familiar with works by Daniel Goleman and Robert Cialdini, so I knew (more or less) the topic; however Margaret did a nice job of putting together information on how to recognize a manipulator and how to defend from them. Good book!