Pretty much all books, history, science, civil rights, anime, travel, or, you know, baby animals.
For me, Heyer books are all about discovering character through dialogue, and this is just as rich as the others. Right now, though, I've been reading to see how she uses history in her stories, and this one is a little weaker in that respect--the details are sharp as ever but they don't really mean much to the story or push the characters' growth. This story could have been told anytime in wartime when the stock market is volatile.