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!
This is a small book covering behavioral traits and tactics used for manipulation, persuasion, and neuro-linguistic programming. It's well written and very easy to follow. The breath of the book, covering the topic so widely, is also a major positive.
Manipulation is a process of communication with the intent to change or influence. It can be an act or statement designed to alter the perception of an individual to persuade them to take certain actions that they might not otherwise take.