Troubled by recent loss, Grania Ryan has returned to Ireland and the arms of her loving family. It is here, on a cliff edge, that she first meets a young girl, Aurora. Strangely drawn to Aurora, Grania discovers that their families are deeply entwined. From a bittersweet romance in wartime London to a troubled relationship in contemporary New York, the Ryans and the Lisles have been entangled for a century.