Wilsberg has to accompany Tessa Tilker, a lawyer Alex works with in Bielefeld, to the island of Norderney, because she needs his expertise in inheritance law. As soon as they arrive on the island, Wilsberg suspicions are aroused – by Inspector Brockhorst, who is staying at the same hotel, and by the children and secretary of the deceased, who are behaving oddly in the dispute over the multimillion-dollar inheritance.