[I've been
Underground Airlines

Really enjoyed this alternate “What if Lincoln hadn’t wound up getting elected?” history book where slavery is still legal in the Hard Four states down South and even the North is a mess of racism and complex rule and class systems to keep everyone in line. The story itself is told by a “bounty hunter” of sorts an escaped slave who is now beholden to the government to trap other escaped slaves. Fascinating stuff. Winters does a good job explaining the details without getting bogged down in them and outlining the racist situation without the book actually falling into a lot of racist cliches.