One thing I find interesting in Heyer's books is how much she dislikes her empty-headed beautiful girls. None of them are vicious - mostly they're terribly gentle and affectionate, in fact - but Heyer can't stand them. Which, well, I couldn't stand the airhead in this one either, but in books like Frederica, where the heroine actually really loves her empty-headed sweet sister, the author's obvious impatience is kind of startling.

Also, heh, I always giggle at the way it's impossible to be blonde in a Heyer 'verse and not blue eyed. You can be beautiful and intelligent or beautiful and stupid, but the beauty, the blue eyes, and the specifically guinea-gold coloured hair are not actually negotiable.