James and Michelle find themselves in the Atlanta airport on a layover. They couldn't be more different, but seemingly interminable delays draw them both to a mysterious flashing green light--and each other.

Where James is passive, Michelle is anything but. And she quickly discovers that the flashing green light is actually . . . a button. Which she presses. Which may or may not unwittingly break the rules of the universe--at least as those rules apply to Hartsfield-Jackson Airport.

Before they can figure up from down, strange, impossible things start happening: snowstorms form inside the B terminal, jungles sprout up in the C terminal, and earthquakes split the ground apart in between. And no matter how hard they try, it seems no one can find a way in or out of the airport. James and Michelle team up to find their families and either escape the airport or put an end to its chaos--before it's too late.