Any book that contains the word "cairn", coupled with "desolate" or "unstable" or "blue" deserves to be read. Even if it's a trail guide.
If you hike Acadia’s mountain trails you’ll see them. Piles of rock, marching up the mountain with you. Why are they there? How were they built? Is there more than one type? Who maintains them? The short story is that they mark the trail. Maybe you know that. Maybe you don’t. Maybe you don’t care about cairns. But you should.