Detective Maria Verne comes to her vacation on the island of Gotland. But instead of a light side job in the local police—half rest by the sea and half strolling through the old town of Visby—she and her colleagues get a run of hot days: in an ancient stone burial mound, the body of a recently murdered man is found. As it turns out, the deceased, Wilhelm Jacobson, was a difficult person.
But who needed his death? And is there a connection between it and two other murders—mysterious swamp lights over Martebo and the legendary silver of a medieval Danish king?