A sweeping, unforgettable novel from The New York Times bestselling author of Maine, about the hope, sacrifice, and love between two sisters and the secret that drives them apart. Watch the video below of J. Courtney Sullivan speaking to librarians at the Penguin Random House Open Book Event in December. Nora and Theresa Flynn are twenty-one and seventeen when they leave their small village in Ireland and journey to America. Nora is the responsible sister; she’s shy and serious and engaged to a man she isn’t sure that she loves. Theresa is gregarious; she is thrilled by their new life…