Published Jan. 1, 2002 by Harper Collins.
Prey

Michael Crichton: Prey (2002, Harper Collins)
- ISBN:
- 978-81-7223-477-5
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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. (source)