His book is about tracking African game, but probably 90 percent of the information in it is transferable to anywhere that you want to trail something (or someone, because there's a chapter on following people). What Mr. Cheney requires of you is that you re-learn how to see, smell, hear, think, and feel. He shows you the science of tracking, and it is, in large part, a science. The rest is an art, acquired only after years of working at it. He explores the nearly-ignored ability to concentrate for long periods of time, and shows you how to do better at it.
Normally, I abhor press releases, but the one that came with this volume sums up the book perfectly, so I'll take the liberty of quoting it: