Two women who look enough alike to be twins-and so different in personality that they might be from different planets--meet by chance in Chicago's O'Hare Airport during the snowstorm of the century. Each is faced with a task she dreads. While on terminal layover, they agree to trade places for a week. Con artist Samantha Smith will fly to San Francisco to deal with a "dying" grandmother while Jayne Roberts goes to Los Angeles to sign Sam's divorce papers.

"Would you stop worrying?" brash Sam scoffs at timid Jayne. "What could possibly go wrong?"

Practically everything, and in bunches. In San Francisco, bad girl Sam falls-literally--for Jayne's half-brother, Ben, who's quite a hunk-a forbidden hunk, unfortunately. In the meantime, good girl Jayne finds herself in bed with Sam's estranged husband. As if that wasn't enough, things "really" heat up when they realize that someone's hot on their trail with evil intent. But who's the target, Sam or Jayne? And will they live long enough to find out why?