The world erupts in an epidemic of mass insanity, and the only person who can stop it is an unstable rogue hacker. A renegade to the core, she can't do it alone this time--this time she needs the help of a straight-and-narrow but hardened New York cop. Can they stay alive for long enough to save what's left of humanity? And what does it all have to do with the freak but spectacular display of northern lights in summertime New York, the set of prime numbers, and a rare genetic disease? The answer may be closer than they think. Chased through the city as the human race comes apart at the seams, they must solve the greatest puzzle of all--that which is buried in the hidden ciphers of our very own DNA.