He set a trend among movie serial killers to follow too, in questioning the moral authority of the people sitting in judgement on him. Peter Lorre's breakout role as killer Hans Beckert used his soft, sad eyes to make him an especially unsettling bad guy. Fritz Lang's first talkie was also one of the first procedural police dramas, but it came with a couple of twists: it's not just the police on the tail of the killer, but the criminal underclass too and we know exactly who the murderer is from the very beginning.
In Weimar era Berlin, there's a child-killer stalking the streets.
