WaPo Duisburg S03E04 - Biersorbet

The owner of the beer sorbet cart is dead. The suspects: a rival food-truck operator, the beer supplier, and the victim's brother. Carsten Heinrich hands the case over to the Water Police, as he had been on leave to take his mother to a nursing home. When she refuses to return, however, he comes back on duty and begins investigating in an unconventional way, right on the spot.