Nina Burleigh reviews Errol Morris's "The Unknown Known," about Donald Rumsfeld and the Iraq War.

In the opening shot of Errol Morris's The Unknown Known, Donald Rumsfeld doesn't look well. His face has the clammy plastic sheen that morticians are paid to produce. We soon come to understand that the former Secretary of Defense is alive and well, but this gray mausoleum of a movie is about death anyway.

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