Less than a week ago I saw a book on one of the main page in an slide show. Unfortunately I did not write any info on it and can't find what is was. Though I know some stuff on it.

The book was a historical read.
It had a crimson red cover with a woman with brown hair and a man (with blond?). The man was shirtless, and had his hands around her? Also she might of been holding a candle?
The book book talked about a woman who was sent to spy for a king (Charles 2)? And the name of the person she had to marry and spy on was something like Lord Barrington?

Any help would be appreciated!