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Grey Trace, a technophobe in a utopian near-future when computers control nearly everything – from cars to crime-surveillance – is paralysed in a freak mugging that leaves his wife dead. But when a billionaire technologist offers him an experimental paralysis cure – an implanted computer chip called STEM – Grey finds that the chip has a voice and a mind of its own. Together Grey and STEM embark on a mission to avenge his wife’s death.