Evil lurks below the surface. Thirty years ago, the town of Peace Falls was flooded to build a hydroelectric dam. To this day, its ruins remain below the surface of Chapel Lake-including the church, miraculously undamaged after all these years, its steeple visible above the water. When his younger sister's body is found washed up on the shore, Owen Saddler follows in her footsteps to the cabin she'd rented on Chapel Lake, diving among the ruins...