Friends（1986）

Chief Detective Schimanski circles an old factory building in a police helicopter in search of a robbed cash-in-transit truck. When he discovers him, he is attacked by the robbers. By the time Schimanski reached the vehicle, the perpetrators had long since fled. The inspector and his colleague Thanner suspect that they have crossed the Rhine. The only boat they see is piloted by Schimanski's friend Frieder Schoen.