The subject line pretty much says it all.
If you're an author, you know exactly what I'm talking about. If you're a reader, then imagine the following:
You've got a great story line, great characters. You have a title and even a cover. You know where and when the story is taking place. You sit down to write......... And your characters pull the literary equivalent of jerking up the emergency brake. Then they simply refuse to cooperate.
Well, that's what happened to me on my Urban Phaze story. Set in Cardiff, Wales, it was all ready to go--then it just...stopped. So, I lamented to my co-author (although this title is a solo thing). Within a few minutes, thanks to Shayne's tireless help and constant questions, I have a new story idea that's perfect for the setting: Cardiff.
So let it be said that characters, no matter how "good" they might seem, are purely evil. And co-authors are gods.