In the Nevada desert, a handful of scientists are battling to retrieve a swarm of rogue micro-robots that has escaped from the lab. The swarm is self-sustaining, self-reproducing and capable of learning from experience. It is, to all intents and purposes, alive. And very, very deadly. Because it has been programmed as a ruthless predator, a predator that becomes more dangerous with every passing hour....And we are the PREY

When the NSA's invincible code breaking machine encounters a mysterious code it cannot break, the agency calls its head cryptographer, Susan Fletcher, a brilliant and beautiful mathematician. What she uncovers sends shockwaves through the corridors of power. The NSA is being held hostage...not by guns or bombs, but by a code so ingeniously complex that if released it would cripple US intelligence. Caught in an accelerating tempest of secrets and lies, Susan Fletcher battles to save the agency she believes in.