A pizza delivery driver for the Mafia who is also the greatest swordsman in the world, a fifteen-year-old skateboard courier, and a linguistic virus running on both computers and people.
It opens as a parody of the genre Neuromancer created and then takes the ideas more seriously than the thing it is making fun of. The Sumerian material should not work and does.
Read April 1993. I came back for Cryptonomicon later and found a writer who had traded the jokes for research.