Henry James's masterpiece, "The Turn of the Screw, " is so unsettling for what it withholds, its ghosts most terrifying when glimpsed (or are they?) from a distance.

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Recent figures have pointed to another turn of the screw.

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Here is another turn of the screw.

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But there is still another turn of the vulnerability screw.

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Regulators likewise run the risk of deterring companies from raising money in America's capital markets if they turn the screw too far, too fast.

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