PREY by Michael Crichton, Knopf, 2002, First Edition, First Printing. SIGNED by the Author. In the Nevada Desert, an experiment has gone horribly wrong. A cloud of nano-particles, 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. THIS IS MY ALL-TIME FAVORITE CRICHTON BOOK!