As one of the cover blurbs reads, there are a lot of "a-ha!" moments in this book. If you are an introvert who never made the connection between your cerebral preference and why certain activities seem to exhaust you, the book is a worthwhile read for that alone. There are also some helpful chapters about how introversion plays a role in professional and interpersonal relationships. The book is extremely readable, and the author has a good sense of humor. So why only four stars? The title seems to promise that introverted personality types have hidden advantages which this book will help the reader access. In truth, the text is more of a litany of disadvantages, most of them related to the lower energy levels introverts tend to exist at. I *do* recommend the book; I just can't give it five stars.