I've actually got two going on at the same time. They're not connected at all, story-wise, but the second one will have a mystery going on which you will need to have read the first to pick up vital clues; you won't get the full picture by the book itself.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'