Years ago, winter came and never went away. Beneath the surface of an ice-covered world, survivors in Colony Seven struggle to keep their fragile society from collapsing as food dwindles and temperatures drop. Already plagued by illness and internal conflict, the colonists suspect the worst when they lose contact with the only other known settlement. A small group decide to go on a dangerous expedition to discover what happened and what they find is worse than they could have ever imagined. Now the fight for survival really begins.