The day has arrived! QUINTESSENCE SKY is now available in trade paperback and ebook formats. I hope you will all enjoy reading it as much as I enjoyed writing it.
Buy an ebook for your Nook/Kobo/iPad/etc.
Some of you have asked about Tor Books, the publisher of QUINTESSENCE. Although Quintessence has sold quite a few copies, it wasn’t enough to turn a profit for Tor, and they’ve declined to publish the sequel. Fortunately, we live in a world where publication has become easy, and even many very successful authors are turning down large advances to “go indie”. The publishing world is changing, and big publishers don’t have the monopoly they once did.
What does this mean for you? It means that QUINTESSENCE SKY is available right now — months, if not years, earlier than it would have been if Tor had agreed to publish it. It means that you won’t see the book on the shelf at your local Barnes and Noble (although you can order it there, if you like). It means it’s less likely to show up at your local library (libraries will be able to order copies, but not for about 8 weeks yet). You can, however, buy the book from Amazon or any other digital retailer, and for any ebook reader. At this point, there is no audio book version, though that was a separate contract anyway (not through Tor), so there is a possibility an audio book may still be created.
QUINTESSENCE SKY continues the story of Horizon, the island perched on the edge of the flat Earth. A strange fire is burning in the heavens, weakening the power of quintessence and sparking tensions between humans and manticores. Catherine and Matthew push deeper into the island, trying to discover its secrets before their people turn to stone. In Europe, a Jesuit priest unlocks the secrets of quintessence, but hesitates to hand the power to his king. He must work together with Matthew and Catherine across thousands of miles to rescue a young Princess Elizabeth from death and save the Horizon colony from destruction.
davidwaltonfiction.com 
I’ve been a fan of your work for ages, and I just discovered you have a blog. Thank you thank you thank you for writing a sequel to Quintessence (which was brilliant)! Buying copies for myself and friends!