I think it depends on which book. Some are more in-depth, and some are collections of syndicated columns.
I might have opened one of her syndicated column books, but at one point, I had three of the books, and in leafing through them after trying to wade through the first half of the first one I picked up, I kept seeing the same argument and the same solution.
So I took them back up to the library and left them for someone else.