
I will start by saying that the book really does not address normal people who have a tendency to manipulate. The book is more focused on people who are habitually manipulative in all aspects of their lives. I do know people whom this describes, but I don't really know many of them. At least I have not been able to identify many of them.
The author's thesis is essentially that psychology as a field does more harm than good in addressing issues with manipulative people because traditional psychology takes the perspective that everyone with problems is a neurotic. A neurotic, at least from a psychological perspective, is someone who has an overactive sense of shame and guilt. Simon asserts that truly manipulative people are polar opposites from neurotics, and have little or no guilt.
According to Simon, all people fall on a continuum between the extreme neurotic (overactive conscience) and the extreme character-disordered (without conscience). Simon states that almost all chronic manipulators are on the extreme character-disordered side of the continuum.
The structure of the book after Simon has established his thesis is straightforward. He provides examples of people (mostly who he has had as patients) who have been manipulated by others close to them. He then outlines the tactics that manipulative people use and provides guidance for how to deal with people who do manipulate.
My goal with the book was to assist in identifying if someone is trying to manipulate me. I think it assists in that regard only in as much as it is a truly manipulative person who is doing the manipulating. The real benefit I got out of the book, though, was the understanding that there is a class of people who really have little to no conscience. That is something that I simply have a hard time grasping. Understanding this, though, will help me not look for deeper meaning in someone's actions where there is none.
One question that was continually going through my head while I was reading this book was whether someone with a very weak conscience could truly ever be saved. How can someone who thinks so highly of himself or herself truly submit to God unless he or she is somehow browbeaten into it? It's not impossible, but only God could cause it to happen. It's probably also none of my business.