"Terrifying." --Scott Sigler "Riveting." --David Brin "Rock-hard realistic." --James Rollins The nanotech was intended to save lives. Instead, it killed five billion people, devouring all warm-blooded lifeforms except on the highest mountain peaks. The safe line is 10,000 feet. Below, there is only death. Above, there is famine and war. Humankind's final hope rests with a scientist aboard the International Space Station... and with one man in California who gambles everything on a desperate mission into the ruins of the old world...

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...