You guys warm the cockles of my heart.
There's a book called "The Ramsay Scallop" you might enjoy, set on the camino. It is classified as "young adult" fiction, but it's a nice read.
If you can read Spanish, there are many potboilers and even sci-fi novels set on the medieval camino, of varied quality. (This is why I am going ahead and getting MW translated into Spanish. She can stand up to any of that stuff!)
But if you want truth that is better than fiction, get hold of a copy of Jonathan Sumption's "The Age of Pilgrimage." It is not narrative fiction, but it almost is... nonfiction writing at its best, very easy to read, and packed with fascinating information.
Hiking in the Valley of Silence gave me an idea. It is not any more particularly camino-y than Moorish Whore was, just the setting is along The Way. Maybe I will get on with it!