An overturned coach full of students. Not all of them will survive. A stranded cable car full of strangers. One of them is a killer. A remote chalet full of friends. Soon they’ll be enemies.

While being evacuated from a secluded boarding school during a snowstorm, Hannah’s coach careers off the road, trapping her with a handful of survivors. If they can’t find a way out in time, the snow will bury them, but someone doesn’t want the students to escape.

Meg wakes up in a cable car stranded high above snowy mountains, with five strangers and no memory of how they got on board. They’re heading to a place known only as “The Retreat,” but as the temperature drops and tensions rise, Meg realizes they won’t all make it there alive.

Carter lives and works in a remote ski chalet with a mismatched bunch of companions. As their generator wavers in the storm, it risks releasing something lurking in the chalet's depths—and their fragile bonds will be tested when the power fails for good.

The terrors faced by Hannah, Meg, and Carter are each one part of the puzzle. What connects them is an even greater horror—one that threatens to consume all of humanity.