Chief Detective Harald Neuhauser has a new girlfriend. Because of her, he makes his colleague Angelika Flierl wait for almost half an hour. It takes almost an hour for the two of them to arrive on the banks of the Isar, where a young, handsome man was found with a gunshot wound in his stomach. His body was washed ashore here. As they continue to work together on the case, another body is driving the Isar downstream. As it turns out, it is Neuhauser's and Flierl's boss, Chief Detective Ludwig Schaller, who is doing an experiment here in his more than unconventional way. Under the supervision of the water rescue team, he drifted downstream in the Isar and can thus calculate where the crime scene must have been after the coroners found that the body had been floating in the water for about an hour.