On the haunted coast, nightmares rise with the tide. All Lars Kelsen wants is a quiet life with his loyal dog-but peace shatters when another desperate apparition begs him to solve his murder. Soon Lars is swept into a labyrinth of secrets, where chilling clues point to a hidden world both above and beneath the waves: the reclusive Octo sapiens, half-human, half-octopus hybrids guarding ancient mysteries. When a vengeful Kraken is unleashed from the ruins of Atlantis, Lars faces a terror that threatens land and sea. With only his steadfast dog and a handful of unlikely allies, Lars must find a killer before those he loves are dragged into the Netherworld. Dark secrets, restless spirits, and mythic beasts collide in this pulse-pounding supernatural thriller, where every tide brings new horrors-and not all sea monsters are bound by the water.