So fantastically good. Without spoiling it, I can say that it is VERY funny in the first half and VERY moving in the second; that it has a stunningly beautiful portrait of female friendship and is populated primarily with complex, hardworking female characters; that it "worldbuilds" (if that's a fair term for historical fiction) without being didactic; and that I swear I recommended it on twitter a dozen times while reading it, because I was struck over and over again with how fantastic it is. (And unlike this review, it also features beautiful and character-appropriate prose.)