In desperation, Cold Lake sends Brian Williams to lead a salvage team into the Rocky Mountains. But outside the small safe zones the world is a foreign place filled with new hardships.
Williams and his team must use all of their skills to survive in the wilderness ruled by the dead. What the team finds in the zombie-haunted mountains will lead them on a desperate adventure through the ice and snow of winter, in search of a possible cure to the mysterious undead contagion.
For salvagers Robyn Cartwright and Amanda Martin, a serial killer is the least they have to worry about. Something is going on with the undead outside the Wall, something that could have deadly repercussions for the Safe Zone, and every living thing within it.