Area X has claimed the lives of members of eleven expeditions. The twelfth expedition consisting of four women hopes to map the terrain and collect specimens; to record all their observations, scientific and otherwise, of their surroundings and of one another; and, above all, to avoid being contaminated by Area X itself.
It is winter in Area X. A new team embarks across the border on a mission to find a member of a previous expedition who may have been left behind. As they press deeper into the unknown, navigating new terrain and new challenges, the threat to the outside world becomes more daunting.