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!