This is a great alternate history mystery, with two engaging and well drawn main characters.
Lucy is a great window into the aristocracy, with enough bristling at the system to make her sympathetic, but enough background so she makes sense. Inspector Carmichael, from Scotland Yard, is no fool, but there is quite a tangle to work through on the murder.
Along the way, the variations in belief and sympathy from the different characters keeps the book feeling real– each character comes from its own place and has its own prejudices. The main characters, fortunately, are quite progressive in their mindset, which does ease a modern viewer into their viewpoints.
I liked this one enough that I’m looking going to check out the rest of the trilogy (Ha’penny and Half a Crown). Though I wonder where they’ll launch from– these characters reached a strong break in their story. I wonder if we’ll follow new people in the next books.