The Garden Intrigue by Lauren Willig (Penguin Group USA, 2012).
Apparently writing historical romance in parallel with modern romance is the latest trend in novels. It works well, actually. You have two stories running in parallel, and when the one gets too emotionally intense, you write a cliff hanger and switch to the other one. The Garden Intrigue, which is less serious in tone than The Winter Sea, is set in France in the early 1800s and England in the early 2000s. The historical plot deals with British spies, male and female, in Napoleon’s court. It probably isn’t going to win any literary prizes, but it is an absorbing read, witty and entertaining.