In the Nevada desert, an experiment has gone horribly wrong. A cloud of nanoparticles -- micro-robots -- has escaped from the laboratory. This cloud is self-sustaining and self-reproducing. It is intelligent and learns from experience. For all practical purposes, it is alive. It has been programmed as a predator. It is evolving swiftly, becoming more deadly with each passing hour. As fresh as today's headlines, Michael Crichton's most compelling novel yet tells the story of a mechanical plague and the desperate efforts of a handful of scientists to stop it. Drawing on up-to-the-minute scientific fact, takes us into the emerging realms of nanotechnology and artificial distributed intelligence -- in a story of breathtaking suspense. Read by Robert Sean Leonard Introduction read by Michael Crichton