A mysterious series of arson attacks is keeping the Husum criminal police on edge: barns and farms in the region between the seas are set ablaze at irregular intervals. Commissioner Wiebke Ulbricht and her quirky colleague Jan Petersen are investigating together with their colleagues from the Flensburg criminal police. However, the trail leads to nowhere. When a person dies in the fire of an abandoned Frisian farmhouse in Keitum on Sylt, the case takes a dramatic turn: the deceased is real estate dealer Frerk Lürsen from Schobüll - the investor behind Viva Mare, a planned holiday home development on Sylt. Power, greed, and jealousy seem to be determining factors in the controversial project.