In great novels we always feel that the writer, at the time of the writing, knows as much as anyone around can know, and is struggling to make sense of what is perceived somewhere in the nerve endings if not yet in clarified consciousness. When a novel gives us less than many of us know -- and is content with what is being given -- we have middlebrow writing. Such writing -- however intelligent its author, however excellent its prose -- is closer to the sentimental than to the real. The reader senses that the work is sentimental because the metaphors are inaccurate: approximate, not exact. To get to those nerve endings a metaphor must be exact, not approximate. The exact metaphor is writer's gold.