A normal announcement by a pilot in a plane is interrupted by the voice of a man who orders the crew to change course and fly to Munich. - Two young men order a taxi one night in Prague. The next day, the injured driver is found by chance in the woods. Reports of the assaulted taxi driver's testimony appear in the papers. Inside an anchored houseboat, the older of the two passengers is furious with the younger. The quarrel makes it clear that the two are stepbrothers. The elder is aggressive and cruel. He wanted to kill the robbed taxi driver to get rid of a potential witness. The younger brother took part in the robbery, but he has prevented the murder and wants to give up being a criminal. As the quarrel grows more serious, the elder brother kills the younger in cold blood. At the airport, passengers are boarding a small plane. The thief, now also a murderer, grabs hold of his hand luggage and walks towards the steps leading to the plane.