In May 1938, nineteen-year-old Matilda Emmerson stands at Cobh harbor in Ireland, waiting to board a transatlantic liner bound for New York. She is four months pregnant, unmarried, and being sent away by her mother, Constance, to protect the family's reputation; her father is a politician. Her destination is Newport, Rhode Island, where a reclusive distant relative, Harriet Flaherty, keeps a lighthouse on Rose Island. She carries two family heirlooms. One is a cameo locket containing miniature portraits of a young woman beside a lighthouse and a man believed to be the Victorian artist George Emmerson. The other is a copy of
Instructions to Light Keepers, inscribed by Grace Darling, a lighthouse keeper's daughter linked to the family's past. On the locket's back are the words "Even the brave were once afraid."
The novel moves between Matilda's story and events a century earlier. In September 1838, Sarah Dawson, a recently widowed merchant seaman's wife, boards the S.S.
Forfarshire with her young children, James and Matilda, traveling from Hull to Dundee to visit her brother George. Sarah wears a cameo locket holding locks of her children's hair. On the remote Longstone Lighthouse in the Farne Islands off the Northumberland coast, twenty-two-year-old Grace Darling tends the lamps with her father, William, the head lighthouse keeper. Grace is content with her isolated life, though her thoughts keep returning to George Emmerson, a Scottish art student she met briefly at Dunstanburgh Castle. Their conversation about Mary Anning's fossils and Grace's knowledge of seabirds and wildflowers left a mutual impression. In Dundee, George sketches Grace from memory, troubled by his growing feelings when he is already engaged to his cousin Eliza Cavendish.
A violent storm strikes on the night of September 6. The
Forfarshire's captain, aware of a leaking boiler, refuses to stop for repairs and presses on. The ship strikes rocks and breaks apart. Sarah carries her children above deck, but a massive wave knocks them into the water. She clings to them on Harker's Rock through the night. By dawn, both children have died from cold and exposure.
At first light, Grace spots survivors on the rock through her telescope and insists on rowing out with her father despite the dangerous seas. While William clambers onto the rocks to help, Grace battles the waves alone in the small boat. They bring nine survivors to Longstone in two trips, including the devastated Sarah. Grace and her mother tend the survivors for five days until the storm passes.
George, learning of the disaster, races to North Sunderland, wracked with guilt for having arranged Sarah's trip. When the survivors reach the mainland, he and Sarah reunite in a silent embrace. Before departing Longstone, Sarah presses her locket into Grace's hands, explaining it is too painful to keep. Grace reluctantly accepts.
Matilda's Atlantic crossing is miserable, but she forms a close bond with her chaperone, Mrs. O'Driscoll, who reveals she knows about the pregnancy. Arriving in Newport, Matilda finds Harriet brusque and unwelcoming. Painted seashells signed with the unfamiliar name "Cora" sit on the bedroom windowsill. Despite their rocky start, Matilda begins accompanying Harriet to the lighthouse, where she meets Joseph Kinsella, the young Assistant Keeper, and feels the baby move for the first time.
Back in 1838, news of Grace's role in the rescue spreads through newspapers, which exaggerate her part and minimize her father's. Public appearances and portrait sittings follow, and Grace finds the fame suffocating. On a trip to the mainland, she learns that George's sister is the very Sarah she rescued. She encounters George at the harbor, and their mutual attraction is palpable but unspoken. Sarah writes to Grace revealing George's feelings, but Grace resolves not to interfere with his engagement.
In Newport, Matilda discovers an old tea chest at the lighthouse containing scrapbooks about female light keepers and an unfinished portrait of a young woman signed with the initials G.E. She suspects it depicts Grace Darling, painted by George Emmerson. She brings the portrait to Joseph's art gallery for reframing, and their friendship deepens over weeks of exploring Newport together.
George arrives unexpectedly at Longstone, claiming Sarah sent him to paint Grace properly. He asks to observe her outdoors rather than posing indoors. As they walk along the rocks, Grace remarks that enchantment is a fickle mistress and they should be wary of her. Within the hour, a storm traps George at the lighthouse for four days. One night, they step outside onto the lantern room platform in the howling wind, sharing a charged moment that stops just short of a kiss. Grace retreats, resolving she cannot be associated with breaking an engagement. When the storm passes, George departs, pressing into her hand a mussel shell containing two tiny painted portraits of himself and Grace. She places them inside the locket, a perfect fit.
When Joseph removes the backing from the portrait, he finds a sealed love letter from George to Grace that was never opened. Matilda reads George's confession that Grace captured his heart but that duty binds him to another. She is moved that Grace never knew the full extent of his love. Matilda's pregnancy becomes impossible to hide, and she confesses everything to Joseph, who tells her she would be a terrific mother. She learns that Cora was Harriet's daughter, who drowned in a riptide three years earlier. When Matilda sees photographs of Cora and notices the young woman's startling resemblance to herself, she begins to question her own identity.
The years bring changes at Longstone. Grace's brother Brooks marries and moves in, and her widowed sister returns with a baby. Grace feels increasingly like a spare part. George marries Eliza, who dies in childbirth; their infant daughter survives only two days. Grace resumes correspondence with the grieving George but develops a persistent cough that worsens into tuberculosis.
In September 1938, Matilda's waters break a month early. Harriet delivers the baby, and during the long labor reveals the truth: She became pregnant at nineteen and delivered twins, but her father arranged for one to be given to a childless cousin. Harriet kept Cora; the cousin's wife named the other baby Matilda Sarah Emmerson. Matilda is Harriet's biological daughter, Cora's twin sister.
Weeks later, a catastrophic hurricane strikes Newport. Harriet battles the seas in her rowboat to reach the lighthouse, guided by the lamp Matilda has lit. A tidal surge knocks Matilda into the water. Harriet dives in, drags her to shore, and revives her. But as Matilda stumbles inside, another wave sweeps Harriet into the ocean. Her body is never found.
In Bamburgh in October 1842, Grace lies dying. George visits one last time and notices the locket at her neck with his portraits inside. Grace asks, "Are you painting me, Mr. Emmerson?" He answers, "I am, Miss Darling. Yes." She asks that the locket be returned to Sarah for her daughter. Grace dies on October 20 at twenty-six, surrounded by her family. George sits alone in the church afterward, pressing a conch shell to his ear.
In Newport, Matilda writes to Constance declaring she will not return to Ireland or give up her child. Mrs. O'Driscoll stays to help, and Joseph moves into the lighthouse while the town rebuilds. On baby Grace's first birthday, Matilda walks the shore with her daughter, planning to one day pass on the locket, the book, and the stories of all the brave women who came before. As the sun sets, she lights an old hand lamp and ascends the lighthouse steps, ready to keep the light.