When cartographer Elara Voss inherits her grandfather's lighthouse on a remote island, she discovers an ancient glass buried beneath the cliffs—a mirror that reflects not faces, but memories carried by the sea. Each night, the tide reveals fragments of lost sailors, drowned secrets, and one recurring vision: a ship that never reached harbor. Drawn deeper into the mirror's truth, Elara uncovers her family's centuries-old duty as keepers of the drowned's unfinished stories. But the sea demands a price for every memory reclaimed. To free the trapped souls—and herself—Elara must finally face the reflection she has fled her whole life.