Great story, mystery, plot, etc. Only a few complaints: There were a few times that the pacing seemed weird, and they were both during intimate moments. The first, when Crane had Day over the desk, the action of him backing away and going to the window was all one paragraph and just felt..rushed. Secondly, the end of the book when they do have sex... it felt as if the author was just trying to get it over with. There wasn't enough build-up in that moment. Yes, the whole book was build-up, which was wonderful, but then the actual sex scene just seemed perfunctory in comparison (no heat).
But honestly, this isn't erotica, and the romance was just one interwoven element, so it's not like those particular things were much of an issue for me.
Beyond that, I wish the author had somehow foreshadowed that the incident in Romney Marshes would connect to the villains and the plot, instead of something unrelated and completely dealt with. She made references to the villains, but it was almost too subtle, and barely even registered.