... you’re going to love False Lights by KJ Whittaker.
I promise I’m in no way affiliated with the author, just giving back after having come here a million times desperately asking for recs :)
I picked this up at the airport last week and couldn’t put it down. The premise is original to say the least: AU Regency, set in a world where Napoleon won the battle of Waterloo and England is under French occupation. The heroes are Hester - a mixed race heiress who grew up in Cornwall with her sea captain father; and Crow, a tortured Earl (are there any other kinds?!?) with some serious PTSD. And they are, of course, thrown together in the most dramatic of circumstances.
I had been looking for a novel just like this - with enough familiar themes and tropes to qualify as comfort read but a new, fresh take on the genre, and most importantly well written and somehow looking at some of the darker aspects of the historical period, including class (and in this case racial) divides.
If you read it, let me know what you think ;)