London in the eighteenth century - the lives of the Fitzgerald sisters, Constance and Verity, intertwine with the nearby household of the Fowlers, who are tasked with providing safe refuge for a mysterious baby from afar. Camden, London, December 17, 2015 - the lives of the Fitzgerald sisters, Constance and Verity, are shaped by the waiting for this boy, who may be dead or may not be. There is no way to know. Deep in the wild beauty of Iceland, a hidden pool grants those who drink from it endless life. For those who have done so, their secret must be kept for two hundred years, yet time is running out, and dark forces are gathering. And for those who have drawn from the pool, it quickly becomes clear that immortality is not a gift, for in the absence of death, true darkness emerges.