Film Noir

I was thinking of the cinematic beauty of 1940's film noir. This picture, by its very nature, could easily be a shot from the Maltese Falcon, Double Idemnity, Elevator to the Gallows, the 39 Steps, etc. It's as if a man were on a sidewalking secretly peering into windows to gather evidence, or simply to keep watch on a suspect. The things that detectives see would make for great photographs...