Kressin is in Copenhagen at an information event when his boss is calling him back to Cologne. He decides to go back by train. On the same train are the two gangsters Brockhoff and Katolli, being escorted back from Sweden by some policemen. Their accomplices plan to free them as soon as the train reaches German ground. When Kressin gets wind of this, he does everything possible to stop the gangsters.
—Troll