Before our first book was published (Knightscares #1: Cauldron Cooker’s Night), Charlie and I wrongly assumed that writing it and others would be our primary responsibility thereafter. We were vying to become successful authors. Of course writing would be our job!

Wrong. Now that we have written 21 books and sold thousands of copies, we’ve learned so much. We’ve come to a startling revelation. As full-time authors, writing is only part of what we do. A small part. In fact, at certain times of...