Have you read Graceling, by Kristin Cashore? It is truly remarkable, and I highly recommend it. In fact, I wrote my latest Book Look column all about the wonders of its first chapter.
This morning I read a fabulous article by Cashore about the challenge of following the rules of the world she created in her fantasy novel. Anyone interested in Graceling, or Cashore, or writing will want to read this. Even if you don't write fantasy, this article is interesting because there are these rules of logic and believability in all novels. Having to manage time, space, and character traits while weaving together a believable and interesting plot... that is the challenge we authors face every day.