I recently found out most movies about serial killers and police procedural owe a lot to a black and white German movie from 1931. M , directed by iconic director Fritz Lang, has all the classic elements to be found in modern-day thrillers. There is the sinister killer lurking in the shadows, the question as to whether the killer is insane, panic in the streets, the hunt for vital pieces of evidence, and politicians breathing down the necks of investigators because results are not happening fast enough. As old as the movie may be, it remains a superb piece of film making that is sadly still very relevant today. This movie is available online completely free, and I don't mean free as in on pirate bay or other piracy websites. It is a piece of cultural history, so the Open Culture website has a 109-minute restored version available for viewing along with information about the film's history. Most of it was unknown to me, although I was familiar with the director Fritz ...