First, a warning: a quick comparison suggests this book is largely a reprint of Gibson-Roberts's earlier book, High Whorling. I was unable to find anything telling how much of the material is new.
However, if you don't own the earlier book, this is a great introduction to spinning on a high whorl spindle, and covers subjects ranging from history to choosing a spindle to how to finish your yarn once it's been spun. An excellent resource for the new spindler, and a good refresher for those of us who've been "around the whorl" a few times...