Brown clearly set out with a purpose in mind with this novel, and accomplished it brilliantly. The representation of how life in the Orkneys remained unchanged for centuries until suddenly being completely uprooted was very well done. Even having no knowledge of the islands beforehand, I was able to picture them through Brown's descriptions. The masterly of the language is excellent, especially with a little flair of local dialects. Vnfortunately, the nature of Brown's purpose makes it difficult for a good plot to surround it, and the story is rather unrewarding. Early on there is an interest in what's going to happen, but as it unfolds it becomes somewhat "hmm," and no more. For this I gave it a tough rating, but I do recommend that people read it, regardless of personal interests because it does show an interesting aspect of life.
If you are like me and were drawn to this book because you heard that Thorfinn is FPP (has a fantasy prone personality), it may not be what you're looking for. The idea of Thorfinn being FPP seemed to be more to move the story and goal along, and I'm not sure if Brown actually had experience with the condition. It's possible that Thorfinn is not FPP but a kid who fantasizes a lot and outgrows it.
I bought a copy of this book in a used bookstore in Thurso before embarking on the Northlink ferry to Stromness in Orkney. This book evokes past and present in Orkney. I really love this book! I sure wish more writers (including myself) could write even half this well...