Do you have this problem? One particular set of characters, for example, has been in my head for a few years now. They are detailed and complex, and feel very real to me. I know how they feel about each other and how they act, how they speak, exactly what they look like. I've taken the time to let them develop themselves. I also know the setting: the place and the time. But I don't know the important part: what actually happens? How do I fix this?