Nano book, reading binge

I received feedback from my agent about my Nano book – Aces! I'm thrilled (and darn lucky, I know) to get feedback so quickly.

The consensus: I have a lot of work to do, but the book is worth working on. This is fantastic news. However, the funny: I fooled myself into believing that I had written a full draft. True, it was short. True, the ending was an open-ended cliffhanger. But since I didn't know what would happen next, well, that must be the end of the book, right? Not true. What I have...