Keeper Ansel saw the underwater star during the lowest tide in a century. It burned beneath miles of black water, brighter than the moon, and every star overhead trembled in answer. Ships began turning toward it. Their crews stood smiling at the rails as if sailing home. None altered course when the reefs tore them open.
Ansel rang the warning bell until his hands bled. The nearest vessel was his daughter's mail steamer, three days early and running without sails. Through his spyglass he saw Mara at the bow. She did not wave. Her eyes reflected a light rising from below, and her lips formed the same word as every sailor around her: finally. Ansel turned the lighthouse beam across the deck. Every face followed it, hopeful and empty, before turning back toward the deeper radiance.
He climbed into the lens room and found dead moths arranged in constellations across the floor. The great glass turned though its gears were locked. Each sweep sent a narrow road of light down through the water, and something at the bottom moved closer along it. Ansel had spent forty years believing his lamp marked the boundary between safety and darkness. Now he understood it had been a signal repeated with faithful precision: here we are, here we are, here we are.
Through the lighthouse lens Ansel saw the truth: the constellations above were reflections cast upward by vast lights sleeping below. The newly awakened star was an eye, and the sea its lid. Each sweep of his lamp helped it focus on the shore. He smashed the lens, but the polished fragments continued turning by themselves.
Mara's ship struck the outer reef but did not break. The sea lifted it on a column of black water and began carrying it over the rocks. Ansel wrapped the lamp in his coat and descended the tower. From the beach, drowned sailors called him by names only his wife had used. He answered none of them. He waded toward the reef while the false heavens overhead wheeled around the bright point in his hands.
Ansel carried the lamp into the surf. The eye followed. At the final reef he opened the fuel valve and set the sea aflame around him. For one impossible moment the underwater star blinked, confusing the little human fire for a rival sun. The wreck-bound ships broke free of its pull.
The lighthouse has remained dark ever since. Mariners avoid the coast when the tide falls too far, for a man-shaped flame walks across the reefs and waves them away. Beneath him, something enormous rolls in sleep. On those nights several constellations disappear, as though the sky itself has closed its eyes.