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Devastating - Marlena Deitrich, the essential femme fatale, seduces a professor whose life crumbles away into disgrace. Emil Jannings yet again performs misery brilliantly. Much as in The Last Laugh, his character begins as a pompous man and is transformed by the cruelties and unsympathetic nature of humans into a humiliated and degraded madman. And then he dies. There is no pitiful reprieve as in The Last Laugh.
Directed by Joseph Von Sternberg, in 1930 German Expressionism was fading in films, after the financial crisis at UFA because of the lavish production of Fritz Lang's Metropolis. The town appears dark and aged.
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(Spoiler - skip to next paragraph if you like surprises)
At first one might imagine that she could benefit this professor who gives up his job to marry this fallen women. But no. I don't even know why she'd marry him except that perhaps she believed no one would ever ask her and she'd like a man-servant.
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It starts slowly, but be patient. The climax and Dietrich are worth it. It's totally depressing but also amazing.