Similar to The Intuitionist one of those books which is kinda about time travel but also kinda about race in America. A little sciencey didactic at times, there are some VERY long digressions into various topics. The ending was not to my taste, a thing on which reasonable people can disagree, but overall a different kind of time travel book, in a good way. Ultimately I was a little confused as to what the actual plot was (there were some multiverse things going on) so I will have to read up on this book on review sites, but I care enough to look it up which is the sign of a good book.