In Mairach, the word of the post commander Felix Hörtnagel is law. Kroisleitner still remembers this well, because he served under Hörtnagel for five and a half years. Now Christof Mally, Hörtnagel's son-in-law, is found stabbed to death on the street after a visit to a disco. Mally was addicted to gambling. At the "Beach Club", on the evening before his death, he was involved in a brawl with his friend Nikolaus Brunner. But his father Walter is sure that Niki has nothing to do with the murder. District inspector Josef Schratt, Kroisleitner's former colleague, on the other hand, could have a motive. The investigations require special sensitivity from Lukas and Nina – and from Kroisleitner the courage to face his professional and private past.
