I'm struggling too, and agree with soup.
And sorry, cote, but honestly, it can't be such a great book if you loved it and still think it is 'Victorian'!
It's set during the Napoleonic Wars. I read it once, and I still noticed that because it's a major plot point (and gone over with detail). It's told from a slightly later perspective, but still very clearly attempting a simplified Austen pastiche, not a later Victorian style.
What I found most jarring was the music - it reminds me too much of Harry Potter. And while I know lots of people see this as more of an adult novel than I do, even I don't think that it was appropriate to make it so YA-accessible as that. It takes away all the real spookiness of it, which is a pity.
But, it is still very pretty, so I'm not about to stop watching.