The result is a wonderful book that you can read from cover to cover, or flip open to review something that's giving you trouble.
What's lacking? There's nearly no treatment of the driver himself. There's no way to learn what to think about before the race, how to mentally prepare yourself. Or how to achieve consistent results, or deal with mistakes. For that, you'll want a Ross Bentley book.
What's really great about this book is that it's like a text book. While that might turn some people off, that's exactly the strength of this book. It teaches you, step by step, what you have to do to minimize your time around the track.
It tackles subjects such as the Racing Line, Turning, Braking and Entering, Accelerating off the corner... and it does so in a methodical manner. It not only teaches you HOW to do what you're supposed to do in a racecar, it also teaches you WHY. And that deepens your understanding, and consequent practice, of the techniques of racing.
If I had a list of 5 books on racing, this one would definitely be in that list.
That said, my one area of disappointment relating to this book is in its treatment of technical subjects. The book strives to describe complex physical phenomena in terminology accessible to the least technically-inclined among us. This goal is worhwhile, and I could understand simplification of the subject matter. However, it's not just a matter of simplification: there are items that appear to me to be factually wrong. The claims seem "kinda right", and essentially correct conclusions are drawn, but it's a case of the ends justifying the means. A particularly worrisome example (for those who have already read the book) is the initial discussion of tire slip angles.
Once the book settles into the primary topic of what a driver has to do when behind the wheel, I found the it to be an approachable and helpful introduction to the world of racing. Many of the techniques provided utilize heuristics rather than detailed analyses; while my logical mind was sometimes left wanting for a more rigorous treatment, the approach used is probably the only workable one given the length of the book, the target audience, and the highly-complex and constantly-changing nature of race driving.
