When I finished Casting the First Stone, I thought I was finished with those characters. I'd told their story, and though their lives went on, I wasn't planning on sharing any more about them. They could live happily ever after...off-screen.
My readers had other ideas.
The first couple of times someone asked if I was writing a sequel, I laughed. After the next couple of times, it got less funny, until finally, I responded, "Well, now I am!"
And I'm so glad I did. We writers get attached to our characters, and it really does require very little to convince us (well, me, anyway) to tell you more about them.
Now, a few people have asked me about a third book.