I think that the most importante thing for a good book is the way it is written. I mean you can do a book on whatever you want, but the thing that makes it special is how you can express what you say: there is a difference between "give me a kiss" and " un baise est un secret qui prende la bouche pour oreille"; of course the plot it is importante, but a great story written in a horrible manner turn bad, while a horrible story written in a geart manner, it is great itself.