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Emily wakes to find that her world has plummeted into darkness--the clouds have spilled out of the sky and taken the sun. 
And there is more to the mysterious fog--the mist is poison, killing everything in its path. Emily's home is no match for the caustic fog, and her family is suddenly on the run for safety. 
But when Emily learns that the machines built to save the world could be the cause of the accident, she turns to her father, Phil Stark, the original architect, hoping they can stop the environmental catastrophe.