SOKO Donau is an Austrian television series.

29-year-old Kathy works as an editorial assistant at a publishing house in Frankfurt am Main. She left her parents' winery in Styria after an argument with her father. But she doesn't feel at home in the big city. On the occasion of her father's birthday, she wants to talk things out with him. She takes a well-known author, who wants to find peace and quiet to write again, with her on the trip home. The two fall in love.

Bus driver Stefan finds a bag containing 32,000 euros at the end of his shift. He decides to hand the money over to the police, but on his way there, he’s forced to confront his own problems. The longer he carries the bag with him, the deeper he sinks into an inner conflict.