Hannah awakens to carnage, all mangled metal and shattered glass. After she was evacuated from a secluded boarding school during a snowstorm, her coach careered off the road, trapping her with a handful of survivors. They'll need to work together to escape--with their sanity and secrets intact.

Meg awakens to a gentle rocking. She's in a cable car stranded high above snowy mountains, with five strangers and no memory of how they got on board. They are heading to a place known only as "The Retreat," but as the temperature drops and tensions mount, Meg realizes they may not all make it there alive.

Carter is gazing out the window of an isolated ski chalet that he and his companions call home. As their generator begins to waver in the storm, something hiding in the chalet's depths threatens to escape, and their fragile bonds will be tested when the power finally fails--for good.

The imminent dangers faced by Hannah, Meg, and Carter are each one part of the puzzle. Lurking in their shadows is an even greater danger--one with the power to consume all of humanity.