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 only more daunting. In the final installment of the Southern Reach Trilogy, the mysteries of Area X may have been solved, but their consequences and implications are no less profound -- or terrifying.