A frozen wilderness. A killer in the skies. When aspiring travel writer Chloe Campbell is invited aboard a luxury airship flying to the North Pole, she thinks she's bagged the opportunity of a lifetime. But she hasn't had long to admire the dazzling icy views before a fellow passenger is found dead in their cabin. Trapped at the top of the world, the group agrees a tragic accident has occurred. But as the hours tick by, fear turns to doubt. It seems everyone's a suspect. And it isn't long before the passengers begin to turn on each other . . .