In this second installment of The Un-United States of Z trilogy, Dr. Zen Marley clings to last vestiges of his humanity. Following desperate rumors of a cure in Los Angeles, he and his crew of colorful but clashing personalities battle human and rotter foes across the southwest.

At the volatile Arizona border, Zen makes a critical decision for survival that puts his friend's lives at stake. And in Los Angeles, Idriss Kimball erupts into a despotic miasma. He leads the rotters on a conquest that only Zen can stop.

With enemies mounting on all sides, Zen finds that his biggest struggle may be against himself.