Perhaps those who are interested in this topic should read a book in a lucid dream and write down what was read in this thread. That way we can see if the stories feel like were reading an actual book and not a book with random nonsense added into it. However, thinking about how the dream can make plots flow nicely is probably reason enough to believe that a dream book can stay in context. I'm not really interested in dream books but I'm going to try reading a book in my next lucid dream.