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I love a good romantic story, full of love and passion and two people finding each other. I also love when a romance novel has a mystery to solve as well. Romance novels that are history based are also good. But a good mystery is always good. I love a good love story too. Not erotic or passionate but like watching a hallmark movie at christmas time.

Definitely check out The Forgotten Garden by Kate Morton if you haven't yet! It switches between different characters and timelines -- some in the contemporary world and some in 1900s London -- and there is some romance in it, although that isn't the main focus of the story. You might like it, though!
I will say that there are points where the plot may seem predictable, but (unless you really don't like the writing style) please don't give up on the book -- there are a lot of surprising twists and it's worth it to keep reading!

Rhys Bowen writes the Her Royal Spyness series, which takes place mainly in Europe right before WWII. They're mysteries first, but there's an on-going rmance plot through the series, and they're lots of fun.

If you are interested in a lengthy series, I would recommend the House of Winslow series by Gilbert Morris. The first book is titled The Honorable Imposter, and takes place in 1620. The subsequent books are a chronicle of sorts of the Winslow family, and take place during real historical events and periods. There is also that "Hallmark movie" romance, where it is there, but it is not overly sexual or lustful. This series was one of the first historical fiction series that I have read, and to this day, I still love to go back and reread them.