From the Number One international bestselling author of Jurassic Park comes this classic Crichton page-turner weaving together heart-pounding thrills with cutting-edge technology.

In California odd things are happening to unemployed scientist Jack Forman. His children tell Jack that strange men have visited the house. And Julia his wife isn't helping she acts even looks somehow different.

Deep in the Nevada desert in the laboratory where Julia works things are out of control. A swarm of rogue microbots designed to reproduce and learn is developing with a frightening speed that has the scientists battling to contain it.

Only when Jack is called in to help does he discover the shocking truth the microbots have been programmed to behave as predators.

And Man is the prey...