A massive 10.5 quake tears apart the West Coast, triggering an unrelenting series of natural disasters that threaten to turn the American landscape into a hellish wasteland. Seismologist Samantha Hill (Kim Delaney, TV's Army Wives) sees an even greater threat: an ever widening fault line that's heading for the country's two largest nuclear reactors. As the rumbling fault line continues to grow, Samantha races to find the one scientist who predicted this would happen years ago - and who can save millions from the ultimate nuclear apocalypse.