It is 1759, and scientists are mapping the laws of the natural world, disproving ancient superstition. The fae of the Onyx Court fear that magic is losing its place in the world—and science threatens to expose the court to hostile eyes. Yet they and the mortals above may have to harness both magic and science to defeat a common foe. A comet is coming, one to which a great foe is harnessed. They cannot defeat it by magic alone, and time is running out...