As publishers – we have no hard and fast rule on this – we just want the book to read easily and well and to take the reader smoothly from start to finish. What we have noticed, however, is that writers often find it easier to step back from their own story and conflicts to write as if the hero or heroine is someone else. It de-personalises some of the spoken comments in the book and distances them from some of the deeply emotional or personal parts. Our advice is write it the way that comes naturally to you and allows you the greatest creative freedom.