Queen City Jazz

In Verity's world, nanotech plagues decimated the population after an initial renaissance of utopian nanotech cities. Growing up on an isolated farm, she finds her happy life changing course when Blaze, the only young man in the community and Verity's best friend, is shot. With Blaze's body wrapped in a nanotech cocoon, Verity sets off on a quest to the Enlivened City of Cincinnati. It is a place of legend, where huge bio-engineered bees carry information through the streets and enormous nanotech flowers burst from the tops of strange buildings. It is the place where Blaze might be brought back from the brink of death. But Cincinnati is a city of dreams turned into nightmares, endlessly reliving the fantasies of its creator, a city that Verity must rule--or die.

Synopsis from Open Library.