I read this about two years ago, I think. I think the novel opens with the scene where the dragons are sinking into swamp to hibernate until it's time (until the magic returns, maybe?). Some time later, there's a woman who wants to study the dragons and their lore, but her father is forcing her into an arranged marriage. She seems to find the ideal man, who encourages her scholarship including financing it (I think he's some sort of trader, and she's buying archaic scrolls, I think in a different language). He's a perfect gentleman, very proper and not pressuring her into sex, and then on the wedding night, he's drunk and forces himself on her. After that, she finds that, no matter how much she tries to gussy up and allure him, he rarely has sex with her, and only when drunk, and generally violent when that happens. Bit by bit, she pieces together the clues of perfumes bought that she never sees, a "hunting lodge" where he retires for prolonged amounts of time, and other unexplained expenses, all of which seem to be happening while his servant, who she trusts implicitly, helps cover things up. Long story short, it's obvious to the reader that this servant is his secret lover, with her being his beard. She gathers all of the evidence together and threatens divorce, whereupon he picks her arguments apart with the help of said servant, who backs up his lies that it's all business and/or a surprise he was planning for her.
Somewhere in there, one of the dragons does wake up, but their hibernation is incomplete, I think with one of the wings not coming back right. Meanwhile, most of the hibernating dragons have been harvested because their bones are a valuable building material. I didn't complete the book, on account of that the storyline with her being so cruelly deceived didn't sit well with me, but I want to say that this was a series.