Mike Manly and the Post Apocalyptic Detective Agency: Grey Matters

Ten years have passed since the GreyMatter nano-virus swept across the planet, leaving in its wake billions of dead. Now, two new species outnumber the remaining human population: the mindless walking dead and intelligent GreyMatter Zoms. As Greys integrate into human society, violence against them escalates; and the murder of a prominent Grey could begin a war between humans and the dead.