Beissl and his wife are quite surprised when Ellis's 15-year-old niece, Ava, suddenly appears at their door from Berlin. In her backpack, she carries not only a pair of headphones but also a few secrets that will soon leave a sour taste in Beissl's mouth and make Johanna an accomplice. When has there ever been a case where one's own colleagues harass a family member for fare evasion? Professionally, the head of the Berchtesgaden police is also confronted with unpleasant memories. Six years ago, he was the first officer on the scene of a bank robbery – and he didn't exactly cover himself in glory.
Now, one of the bank robbers, Martin Zimmermann, has been murdered in the Böcklmoos moor, shortly after his release from prison. His accomplice, Vitus Neubert, was never caught, and the stolen money was never recovered.