Tom is about to graduate as a third-degree ghost hunter, and to do so he needs to pass a test. Together with Hedwig Kümmelzaft, he goes to the village of Swamp Pond, where a mysterious spirit terrifies the locals. But the situation turns out to be much worse than the hunters expected. The Swamp Pond is shrouded in fog, the houses groan pitifully, and the smell of rot is in the air. An ancient evil was awakening in an inconspicuous village.