Spiekermann and Ginger have, essentially, nothing to say. Unfortunately, they spend over 150 pages saying it. The worst of it is that there are all kinds of color photos, headings, etc., so the book is printed on heavy, glossy paper. This is bad because (a) glossy paper is hard to read text on (as ANY designer should know) and (b) both heavy/glossy paper and color inks are expensive. Thus, you must pay $20 for a book that could very easily be condensed into a $1.50 pamphlet.
This book is often touted as an introduction into type because it is basic and easy to access. The problem is that it is too basic. If you know what a serif is, this book is too basic for you. If you know that it is possible to adjust the spacing between letters, words, or lines of type, then this book is way too basic for you—even if you aren't familiar with terms like letterspacing and leading. Get a book that will be a real introduction—if you're going to learn about type, learn enough that it will make a difference. If you want easy access, pick up something by Robin P. Williams (doesn't matter what—they're all about the same). If you really want to learn something, get Robert Bringhurst's The Elements of Typographic Style. Whatever you do, pass this book up. You could learn more, cheaper, from a high-school yearbook instructor.