We have been asked to build a narrative-based book from Skynet, soemthing like the "old school" Publican books. I had a go with trying to modify the Book.xml file, but I don't think that will work. I think the way to do it is to have an option to build books in a linear way, with each chapter representing a cross-cutting concern, like Installation, Administration, Configuration, App Development. Each of those chapter files would be named in the Book.xml and could be re-ordered by hand to suit the situation. The navigation bar would be turned off and the front page of the book would be the index.html with static ToC.