I am considering dividing the story I thought could be contained by a single novel, Cherry Bomb over two novels. I'm two thirds through the latter, and it's becoming obvious it's a much bigger story. If I do this, if my publisher is agreeable, it would add a fourth Siobhan Quinn novel, Ruby Red. It would have to be written after Dinosaurs of Mars, The Good, The Bad, and the Bird (the next Dancy series), and at least the first half of Beneath the Wide Carnivorous Sky.
I have a phone conference with my editor at Penguin on Monday to discuss this, and I should be able to tell you more Monday evening or Tuesday.