I finally got around to watching "M" (1931) - the Fritz Lang classic. It is like watching a double episode of Law & Order. I was a bit surprised at how dark the villain is portrayed. I guess being a German film it did not need to comply with Hays Code nonsense (although I am not 100% sure if this would have failed the code sensors, it is definitely a pretty heavy subject). Speaking of the villain, Peter Lorre is fantastic in this.