Dead Rising
"Dead Rising" started as a screenplay. I finished the screenplay long before I began work on the novella. I decided "Dead Rising" would make a  pretty cool novella, and as I wrote it, other story lines began to develop -- story lines that were not present in the screenplay. The novella version became a story of its own. Sales of the book so far have  shown my instincts were right. I have since re-worked the screenplay to  include elements of the story from the book.