When I was thinking seriously about doctoral work (a half-dozen years ago), I purchased this book and another called How to get a PhD by Phillips and Pugh. The latter was far superior to this book; thus, I don’t recommend buying it.
It’s organized chronologically, as if it’s taking the reader through the emotional/intellectual/experiential ups and downs of the PhD student. This organization works well and reads easily. The authors adopted a chatty and informal tone that doesn’t sit so well. Further, their observations, with only a handful of exceptions, seemed not far beyond the realm of common sense. They’ve included a number of historical anecdotes which are interesting, but not particularly helpful.
If you’re looking for a solid introduction to and guide through PhD studies that is serious and packed with useful information, I’d avoid this volume.