I stick to the rule that I cannot review a book that I have not finished. So when I tell you I spite-read this all the way to the end just to share my thoughts...
Folks, the writing. The writing is the worst I have ever encountered in a traditionally published book. Even if the plot hadn't been the most ridiculously contrived, nonsensical story, the writing would have made me throw the book across the room several times. And it's a hardcover so it would have seriously damaged my house and its inhabitants.
This is what a first draft sounds like. A rough first draft, mind you, where you're just trying to get the basic stuff down, until you go over it again and actually write it properly. A draft that includes things like "write a short conversation between X and Y that contains the following information". It's THAT bad.
The dialogue: First off, nobody talks like that. Second, nobody talked like that in late 18th century England, or France for that matter. (At some point an aristocratic English lady says "sorry" - what?) Why set a novel in a historical time period if you're not going to reflect that setting in your writing. What's the point?
Most of the dialogues read like the two people aren't even talking to each other, they are just saying saying things, in sequence. The responses are random and often apropos of nothing. Dialogues last a few lines and end abruptly. At one point the investigator asks someone a question and they literally answer: "Yes, I remember this person, let me info dump a bit, now I need to go to bed, bye".
The author has apparently never heard of "show don't tell". Everything is told. Duval loves Edmee, Edmee loves Duval, for some reason, just trust me okay? You want to see them develop a relationship? Nah, why waste time writing nuanced and conflicted characters and their development over the course of the story, when I can just tell you they are nuanced and definitely in love. Saves time, no?
Needless to say, I didn't engage with the characters. They are cardboard cutouts with no inner lives. We are sometimes told they feel things, so that should be enough to make me care.
I wish I could say the plot saved this book, but, you know, it didn't. The main arc might have been fine had any of the characters acted like they actually were from the late 18th century.
I'm still wondering how this got published. The acknowledgements mention that the editor changed halfway through the writing process, but even so, this quality of writing should never have seen the light of day.