After the body of a young woman is recovered from Lake Mattsee, the two cops not only face a major professional challenge that takes them into the dark past, but also come into contact with Mattsee's dark history and reach their limits privately.

The body of a teenage girl is found at the foot of a waterfall, a heart-shaped stone in her hand. The investigation leads the police on the trail of a local legend.

The Salzburg police duo Heilmayr and Merana is looking for the murderer of a noble call girl.