Frøken Nitouche is a 1963 Danish comedy film directed by Annelise Reenberg and starring Lone Hertz and Dirch Passer. It is based on the operetta Mam'zelle Nitouche.
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.
During World War I, the engineer Torben returns home with secret papers from the Russian Tsar to the courier Tuschin, Torben's best friend. Tuschin is found murdered, however, and to solve the murder, Torben stays at his hotel. Here he meets several mysterious people, not least the breathtaking stenographer Inge. But in the hotel, no one is who they pretend to be.