The Deception of the Emerald Ring by Lauren Willig
This is the third book in the series by Willig, following The Secret History of the Pink Carnation and The Masque of the Black Tulip. They are sort of a combination of Regency romance and chick lit that are fun to read.
Eloise Kelly is in England to find information on the flower spies The Purple Gentian and The Pink Carnation, since everyone knows about The Scarlet Pimpernel. She manages to find the information unmasking The Pink Carnation in family papers belonging to Mrs. Selwick-Alderly, but her really cute great-nephew Colin Selwick is adamant that it not be published. Throughout the first two books, the story alternates between Eloise and Colin (the chick lit part of the story) and the Regency romances that tell the story of the flower spies and their organization. In this third volume, Letty Alsworthy tries to stop her sister Mary from eloping with Lord Pinchingdale, who is a good friend of The Purple Gentian. When Letty is the one found kissing Lord Pinchingdale at midnight in his coach wearing her nightgown, they must marry. Immediately following the wedding, Lord Pinchingdale goes missing, and Letty discovers that he has sailed to Dublin, so she follows. Together with The Pink Carnation, they manage to stop the Irish revolution of 1803.
I like the historicals better than the story of Eloise and Colin. The current story is stretched out over all the books and gets annoying at times. I had taken The Secret History of the Pink Carnation home and not gotten it read, but after Nancy Pearl recommended it in one of her columns, I checked it out again and enjoyed it. The covers, while beautiful, don't really do a lot to recommend these books, in my opinion.