Everything in movie was predictable, except one moment - which happened to be - unfinished in dead end street.
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Scenario is lacking the deeper dialogs - because everything seems rushed - and shallow.
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Then suddenly - the story began to look like the "Misery" - with locked hardly movable Delphine, with her injured leg - completely depend - of her younger "new friend" - in village house - with no people around
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The "Misery" crawl out completely when Delphine ended up in bed, poisoned, and helpless,
refused to surrender to her bully.
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So the movie was not so original, and Misery was far better in creating story tense.
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Actually the Misery part, should be the best one, but it came on 3/4 of the movie, probably seeing by Polanski as "peak" in story telling
but it was to fast out - and leaved flat,
leading imediately to end of the movie.
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It's kind of shame - because the story could be less predictable, and be better filmed and screenplayed.