The cult team of the Husum criminal police takes to the water. The Husum cult commissioners are faced with a mystery: the missing wife of the savings bank manager is not the corpse found in the Wadden Sea. In the mysterious world of islands and islets, between ebb and flow, the Husumers encounter suspicious sailors, quarrelsome crews, and sworn brotherhoods – and soon, Chief Hunter and his team must realize that there are entirely different laws at play on the water.