Living on Mt. Rainier, Gus and Zoe are faced with a tough decision; stay and face starvation, or leave and face the dead that wait lower in elevation. The group will encounter new dangers and struggle to find themselves and each other again. The dead are more ruthless than ever, and the living more desperate. Natural disasters, a new threat from the dead, and tragic losses will either break Zoe and Gus apart or drive them closer together.