You're an author and writer. You outline, or have the latest book underway. Things are going well, the story is moving along, the outline is figured out and suddenly... gasp! The story runs out!
You thought you had the story worked out and enough situations and scenes to fill the required amount of chapters. Now it seems you may be several chapters short.
So, I'm asking authors: anyone been in this situation? How do you address it?
How did you fill in the gap? What did you add to expand the story without it just being "filler?"
What is needed to fix this kind of situation? What is missing in a book, I'm mostly interested in mystery, that this would occur?
Love to hear your thoughts as I work on my ongoing mystery!