Robert Mitchum was the perfect film noir lead actor in Out of the Past (1947) being a tough guy with a wonderful soul as revealed by his voice over narration gets into trouble by being a victim of femme fatal Jane Greer. All further brought out by the creative use of lighting and complete tonal range of black and white by cinematographer Nicholas Musuraca.
Lawrence of Cinema 
Great movie, I really like your overview, brief and to the point.
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