Paul DiFilippo (theinferior4) has written about Black Sheep very nicely:

...[A] lot of this dark-and-dismal literary forecasting is often just atmospheric, setting up dictatorial straw men for the hero to rebel against. Every Luke Skywalker needs his Darth Vader. Only a minority of science fiction dystopias attempt to plumb the real existential roots of oppression, the flaws in humanity's nature that undermine our best attempts at organizing ourselves into social units.

One such arrives now from newcomer Ben Peek. With the gravitas of a Margaret Atwood or Kazuo Ishiguro, Peek, in his debut novel, Black Sheep, crafts a quietly horrifying world displaced from ours by a century of time and an implosion of globalist attitudes. After worldwide racial wars wreak massive devastation, the UN asserts transnational supremacy and divides every major metropolitan area into separate-but-equal enclaves for Asian, African, and Caucasian peoples. No mixing allowed. Multiculturalism is a crime, with transgressors apprehended by the dreaded Segregators. Punishment is Assimilation: the literal bleaching of the offender to a ghost and the implantation of mind-control devices, creating a slave for society's scut work.

It's an ever-potent trope -- Rupert Thomson plumbed a similar schema in his

Divided Kingdom

(2005) -- and Peek puts his anomie-driven hero Isao Dazai, reluctant immigrant to Asian-Sydney, through a Kafkaesque ordeal, carrying the reader along through multiple milieus of this warped world, where the laudable attempt to gain stability has been perverted by totalitarian means.

Never heard of Divided Kingdom, though, so I'm going to go check that in a second. You, on the other hand, should buy the book from Amazon or Galaxy Bookshop or even Barnes and Noble, which is where the review comes from.

Link.