The Unwritten: Tommy Taylor and the Ship That Sank Twice - Mike Carey

You have to be reading the main title of The Unwritten to enjoy this prequel (which seem to be the case for all prequels), but it is a fun little tale (or two tales) about both the--perhaps--insane author that decides he will raise a son in parallel with a fictional character he created to see if he can blur the lines between fantasy and reality. In this story, we read the beginning of the boy wizard, Tommy, and friends and their first encounter with their arch-nemesis, all the while hearing their creator justify destroying real lives for the sake of "art."