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.

Every attempt to destroy it has failed.

And we are the prey.

These hardback books are both in great condition and the 1st one weighs 1 lb and 1.7 oz - 501 g and the 2nd one weighs 1 lb and 8.1 oz - 684 g.