Seventeen-year-old Micah has always heard the whispers—voices trapped in the old lighthouse where he lives with his reclusive grandmother. When she vanishes without a trace, Micah discovers her journal revealing an impossible truth: the whispers belong to the drowned, souls bound to the sea by an ancient covenant his family has guarded for two centuries. As a ferocious storm approaches and strangers arrive searching for something buried beneath the lighthouse, Micah must unravel his grandmother's secrets before the tide rises. But the dead have demands of their own, and Micah must decide how much he's willing to sacrifice to silence them forever.