I certainly don't sit down and plan a book out before I write it. There's a phrase I use called "The Valley Full of Clouds." Writing a novel is as if you are going off on a journey across a valley. The valley is full of mist, but you can see the top of a tree here and the top of another tree over there. And with any luck you can see the other side of the valley. But you cannot see down into the mist. Nevertheless, you head for the first tree.
Terry PratchettContrary to popular belief and hope, people don't usually come running when they hear a scream. That's not how humans work. Humans look at other humans and say, 'Did you hear a scream?' because the first scream might have been you screaming inside your head, or a horse backfiring.
Terry PratchettConsider the situation. There you are, forehead like a set of balconies, worrying about the long-term effects of all this new 'fire' stuff on the environment, you're being chased and eaten by most of the planet's large animals, and suddenly tiny versions of one of the worst of them wanders into the cave and starts to purr.
Terry Pratchett