Count Zero is a science fiction novel written by William Gibson, originally published 1986. It is the second volume of the Sprawl trilogy, which begins with Neuromancer and concludes with Mona Lisa Overdrive, and is a canonical example of the cyberpunk subgenre.Count Zero was serialized by Isaac Asimov's Science Fiction Magazine in the 1986 January (100th issue), February and March issues. The black and white story art was produced by J. K. Potter.