When marine biologist-turned-keeper Eliora "Ellie" Marlowe arrives at the isolated Greyhaven Light, she expects solitude-and a storm of secrets. A steady amber flame, a perpetual fog, and a phantom ship that appears only within the lantern's circle hint at an ancient covenant between the lighthouse and the sea.Guided by cryptic whispers, a cracked porcelain doll, and a hidden stone chamber, Ellie discovers that the lighthouse is more than a beacon-it is a living pact. Every ten years the sea demands a tribute, and the lighthouse's light is the fragile bridge that keeps the tide at bay. With the help of the pragmatic fisherman Jonas Reed, the diligent historian Mara Whitlock, and a determined village, Ellie must: unravel the diary of the original keeper, Alistair Grey, forge a feedback system that turns the lighthouse into a resonant defender, confront a modern corporation's drilling plans that threaten to shatter the pact, andpass the mantle to a new generation before the next tide rises.Through whispered lullabies, hidden chambers, and a daring blend of folklore and engineering, Greyhaven Light weaves a haunting, lyrical tale of memory, sacrifice, and the relentless power of the sea. As the lantern's flame steadies against ever-deepening darkness, one question remains: Will the light ever falter, or will the tide forever remember?