Writing a sequel - Kate and Cecy

Alex asked "how you felt about the stand alone getting a sequel with the Kate and Cecelia books. I think you did an amazing job with escalation with these books, but did you have a hard time creating the right level of escalation?"

Well, for starters, "getting a sequel" isn't quite the right phrase. The first Kate and Cecy book, Sorcery and Cecelia, was put out by Ace/Berkley, who were not all that thrilled about the book at the time and most definitely did not want a sequel. So the book...