Tenderness of the Wolves
Die Zärtlichkeit der Wölfe (original)
A German serial killer preys on boys and young men during the so-called years of crisis between the wars. Based on the true story of Fritz Haarmann, aka the Butcher of Hanover and the Vampire of Hanover.
Starring Kurt Raab, Jeff Roden, Margit Carstensen, Ingrid Caven, Wolfgang Schenck, Brigitte Mira, Rainer Hauer, Barbara Bertram, Rainer Werner Fassbinder, Heinrich Giskes
It's a crime and drama movie, and has a rating of 6.3 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Denmark.