Unrelated to the story itself -- I hate it when covers don't match the book. Yes, the cover is beautiful, but Mari has tons of curly, dark hair. Her hair is prominent in the story, but wrong on the cover. I know it's a marketing decision based on what's available, but it bugs me.
Okay -- the story. The author set up the characters of the leads right away through their actions. They were believable and layered. I found them both sympathetic and rarely wanted to slap either of them. I was rooting for them to get past their differences, but their personal happy ending was not at focal as discovering the intelligence leak. This is a plot, rather than character, driven story. The setting, the political intrigue, and the eminent danger was was interesting, but took me out of the romance to a point where the romantic elements were side plot. It straddles a line between historical fiction and romance (something I understand), but as such, is not an emotionally satisfying romantic read.
It was well written, with rich (but not overwhelming) description. I would read this author again.