For some reason, when I've read this book over the years, I've always skipped the first half of the book when Cam and Ainsley are in Scotland. I think I used to feel like the narrative dragged until that point, but rereading it this time--I can't imagine why I ever thought that way. So much happens in those first 150 pages or so.
Cameron has been one of my favorite characters since we first met him in The Madness of Lord Ian Mackenzie. There were hints that his background was particularly tragic, and as hard and tough as he seemed, his love for his son was evident. Cam and Daniel usually stole every scene in Madness and Lady Isabella's Scandalous Marriage. Ainsley had popped up, I think, first in the second book. She may have been mentioned in the first book, but I don't remember her. There's not much to her in that appearance, but that fits into who she is as a character: someone who has made a decision to blend in and be useful to others.
This book is darker than I think either of the first two books. Though Ian and Mac had their own issues (and Ian's time in the asylum and childhood is horrific), Cam's story is very dark and when Ainsley pushes him to make changes and come out of his shell, I almost want her to just stop bringing it up. To stop making her remember. It's beautifully done but emotionally draining.