"Darktown" by Thomas Mullen. Set in Atlanta in 1948, and based on the true story of the cities first 8 black police officers, the eponymous darktown being their beat. Well written, and historically interesting, albeit sickening in it's depiction of casual racism, some of which no doubt remains today. One interesting (to me) snippet, the local politicians were Democrats, the Republicans being the party of Lincoln, emancipator of slaves.