This the third book of the series which I read out of order. This series is better in order as it refers a lot to actions in book 2. In this, it is the young sister (18) for the main character. Previously, she had done the "season" in London and is now back in the highlands of Scotland where she must decide on a future husband. Will it be Lachlan, her childhood crush? or Will it be another Scottish Lord or (gasp) an Englishman?
Hmm. This being a romance novel rather than a mystery it is not too hard to guess.
The fun is in the getting there. Of course, it ends just right.