 While on the road, Dean and Sam read on the newspaper about the disappearance of three people in Lake Manitoc, Wisconsin. Once there, they use forged identity and meet Sheriff Jake Devins and later his daughter Andrea Barr and her son Lucas Barr. Dean and Sam are informed that a dam project up the valley will cause the lake to drain and be gone completely in a few years. Their further investigation discloses a hidden secret from the past of three locals.