This book has a TON of information. If you need to know anything about the subject of German/Austrian krampus traditions around Christmastime, then you can save yourself a ton of research and just pick up this book. In addition to the wealth of information, the book is loaded with both historical and contemporary pictures.
Why only two stars then? Because this book reads like a 300-page encyclopedia entry. It is beyond dry and, while informative, is not entertaining in the least. I knew I was in trouble when, only 38% through, I pulled up the table of contents hoping to see that the last 1/3 of the book was made up of index, notes, bibliography, etc (spoiler alert - it isn't).
If you are a krampus fanatic, or looking to do some in-depth research on the subject, I would bet you could do no better than this book - it really is a fantastic wealth of information. If you have a casual interest in the subject, piqued maybe from an Anthony Bourdain holiday special from a few years ago (like me) and you are looking for an entertaining history to read - this isn't it.