Skilled direction by the star, Robert Hossein, although the story was full of unsurprises. Hossein's portrayal of real life Weimar-era serial killer Peter Kurten was a little too detached, almost bored. Superb camera work and lighting, although the music grated at times. This movie was unknown to me until I found it online. It appears to have been released the same year as The Night of the Generals, a movie set in Nazi occupied Poland a decade later. With both films featuring Teutonic serial killers, I guess one of them had to step aside. Here there were no subtitles, but the dialogue spoken so clearly and free of argot I missed only a little. The people probably spoke non-colloquial French because they were supposed to be Germans, and everyone knows Germans in the 1930's spoke without argot. Marie-France Pisier was good as the chanteuse of a subterranean boite called El Dorado.