Two years before Zodiac, Capote depicted Truman Capote making a fuss about possibly not having an ending for his seminal true crime novel In Cold Blood. Robert Graysmith, on whose non-fiction books Zodiac is based, had no such qualms, nor did director David Fincher. The comparison may be unfair; Graysmith is no Capote (but then, who is?), and In Cold Blood isn’t a whodunit – though technically neither is Zodiac, since after more than two hours we don’t learn who [has] done it so much as who-a-very-small-group-of-people-think-done-it. In a nutshell, this is a movie about a hunch.

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