I'm editing my book and it has a prologue. This is not told from the perspective of one of the MCs but a minor character and it gives flavor, a tiny bit of background and whets the readers appetite (hopefully) with some action before the book begins. The book then begins with introducing the main characters and the start of the issues they will face (not all of them but at least a taste.) My problem now is that I can't decide whether or not to change the prologue into a first chapter by lengthening it or just leave it as it is. I have read several writing guides that advice extreme caution if you decide to have a prologue and now I'm just not sure. What are your thoughts?