Meg and Harry have retreated to a remote cottage on the northeast coast of England to recuperate from the mental and physical stress of losing their baby. While exploring the ancient coastal landscape, Meg chances upon eighteenth-century quarry mines reclaimed by nature. But birds and butterflies aren't all she finds. When a young woman goes missing, Meg must try to make sense of her many bizarre experiences: muddy handprints on the walls, savage dreams, and a visit from a stranger who may not be what she seems. And something else is lurking nearby, something that adapts and feeds on grief. And Meg may not be able to stop it…