The Young Clementina caught me off guard because 1) It is not light-hearted. Most of the characters have been broken by war, sin or loneliness. 2) The title is completely wrong. Young Clementina plays a part in the story, but is not its main focus. 3) It has a lot more drama than I'm used to in Stevenson's books.
I dislike spoilers very much, so I will finish by saying that Miss Dean comes through her trials a stronger, better person. If I had known that this was Stevenson's attempt at a more serious novel, my expectations would have been different, and I probably would have enjoyed it a lot more.