A model family's happy life unexpectedly goes off the rails when the carefree Hedi, played by Laura Tonke, suddenly starts having panic attacks. First mental illness and then drug dependency – the happiness that these happy-go-lucky thirty-somethings once took for granted suddenly seems unattainable, and their world fragile and uncertain.

The 16-year-old daughter of the highest dignitary in Hüttenberg is found murdered in the disused mine. For the first time, Muck has to deal with a case of this magnitude.