I've read and enjoyed a few of Genevieve Cogman's Invisible Library books, which are hard to characterize. But if I had to pick a genre, I would call them fantasy mysteries or fantasy spy novels. But I haven't read any of her newer Scarlet series, which is, per its blurb, a re-telling of
The Scarlet Pimpernel, but with the addition of vampires. So I debated whether to post this here, or in sci-fi/fantasy, but opted for here because I consider
The Scarlet Pimpernel itself to be a romance.
I loved
The Scarlet Pimpernel and its sequels anyway, so not sure they need vampires, but I am willing to give it a chance, especially for free. And sure enough, the first book in the series, titled simply
Scarlet, is free right now at Kindle and Kobo UK, but not in the US.
Kindle UK:
https://www.amazon.co.uk/dp/B097N3Q2HT
Kobo UK:
https://www.kobo.com/gb/en/ebook/scarlet-47