When the sky turns green and every engine dies, Matthias and Rosanna Shields have the skills to survive high in the Yellowstone backcountry. Their neighbors don't. Chris and Cindy are city people trying to save a marriage, and someone is hunting them: a man whose brother died on Chris's operating table. As four hundred starving strangers converge on the valley, survival stops being about food and starts being about who you're willing to become.
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