This book primarily serves as--and is best when considered as--a collection of anecdotes from English history. Author Christina Hole does try to organize the chapters by theme, but unfortunately the book actually suffers for it: many of the historical events defy easy categorization, so some degree of repetition is required. Occasionally multiple generations of a family will be involved--I think here specifically of the Device family--and that family name comes up several times, in the span of no less than sixty pages, and without a coherent narrative because of Hole's dogged insistence on dividing chapters by theme.
Hole often fails to define her terms: for example, she refers to the brutal practice of "watching" a suspected witch, but never actually defines it. (I do think I found a description of "watching," but since the paragraph never used the term "watching," a reader can't be sure.) A glossary at least would have been helpful, but of course it would have been best if she'd defined each term clearly as soon as she mentioned it.
Hole's perspective on witchcraft is never quite clear. At times she acknowledges that there were a great deal of false accusations (an entire chapter is devoted to this), and confessions given under duress or torture, but at other times is entirely credulous as to the guilt of convicted witches, no matter how outlandish the accusations or confessions. She makes it clear that there is a difference between the worship of non-Christian gods and devil-worship, but often obscures or ignores that difference, and she never goes into much detail. (Also, as an aside, everything she says about the Cathars--a heretical Christian sect--is wrong, but in fairness she may not have had access to accurate sources.) She at least tangentially acknowledges a mixture of Christianity and paganism in some of the magic, but doesn't explore this (it's touched on a bit more in her Saints in Folklore book). Furthermore, while she notes that part of what may have constituted "witchcraft" was simply ages-old folk-medicine, and that some witches (self-identified or not) attributed their magic to the workings of an "alien god" OR to a saint, she doesn't take time to consider where the line might be between a miracle-worker and a white witch: that is, between a "holy person" and someone seen as a not-to-be-crossed witch. The idea that there could be a fine line--a very fine one indeed--between religion and magic, as well as medicine in this time period, escapes her interest. I'm not sure why.
To conclude, I did glean some interesting perspectives on witchcraft in England, and some (although not all) of her historical anecdotes are well-footnoted. However, the book is so poorly organized, so haphazard in mission, that I think there must be better sources for those interested in the topic.