One night there is a terrible accident in the little station town of Bredsted. The young son of the rich Mogens Kragfelt is struck by the Natekspressen (P. 903) near the station. Police chief Aagesen sends the young detective officer Lund (Jørn Jeppesen) to investigate the case, where there are various mysterious circumstances, among other things there are traces of fights at the rails just where Kragfelt was crossed.