This is a fast-moving book, from the very first scene it grips you. The premise is that words can control people, and a secret cadre of people (in other times they would be called "wizards") know which words to use to control people. Sort of like the movie "Memento," the order of events is not chronological, so it takes a while to fit all the scenes together, like a puzzle. The book keeps you guessing until the end.
On the other hand, it's not terribly well-written, and lots of times I was confused as to what was happening during action scenes.