I’m intrigued by subtext and, in particular, the space between the words in a novel.
Yet perhaps the most perfect example of this is not in a novel at all, but in a movie. It’s the little miracle that is Roman Holiday, starring a luminous Audrey Hepburn as a stifled princess. Gorgeous Gregory Peck plays against type as a distinctly dodgy expat newspaperman. They don’t have a Happy Ever After ending, either. Yet its perfect, mostly because of that extra layer of meaning.
Although feel it would probably be a better word. And sometimes we don’t even realise what it was until we’re describing the story to someone else.