Though overall a very useful book, this book seems to be a somewhat disjoint conglomeration of various articles about aircraft design that perhaps were once published in a magazine. There is no soft introduction for the beginner - be prepared to be inundated with a slew of graphs, equations and very dense writing that will demand some qualitative understanding of basic aerodynamics. (I would personally recomment _Understanding Flight_ by David Anderson and Scott Eberhardt, which is not very mathematical and quite easy to understand for a novice like myself.) The fact that these disjoint chapters don't flow together is a bit annoying, but on the other hand it is quite pleasant to have such a wide array of specific information in such a portable book. The section on reading airfoil charts is terse and yet intelligible. Be warned: if you're not familiar with the basics, you might get lost quickly and have to reference another text, as did I. If you're just a little dusty, however, there will be a very short review. (For example: how is angle of attack different than incidence, and how do these two things relate to both cambered and symmetrical airfoils? What causes a pitching moment?)
There is some discussion about exotic designs (three airfoil, canard, tailless and delta-wing, NASA safe wing, float design, etc.) although without much in-depth discussion about theory (for example, the NASA Safe Wing chapter described mostly about the history, advantages and characteristics of this device but very little about the theory or even implementation in a new design.) The author clearly tried to cover a lot of topics in a small amount of space, thus I would rate it more vast than in-depth.
Overall a good book with many examples (mostly from the author's own designs). Very useful, with an appendix of characteristics for the airfoils and models used in examples.