FINALIST FOR THE PHILIP K. DICK AWARD "Compelling. His novels take readers to the precipice of disaster." -San Francisco Chronicle Cam Najarro and Ruth Goldman have developed a vaccine to protect Earth's survivors from the Archos plague, but the shattered U.S. government will do anything to keep the vaccine for themselves. Intent on sharing their cure, Cam and Ruth must cross the apocalyptic wastelands of North America... never realizing a greater threat is about to strike...