There are 3 books in the Castles Ever After series. The newest book is When a Scot Ties the Knot which came out in 2015.

As the daughter of a famed author, Isolde Ophelia Goodnight grew up on tales of brave knights and fair maidens. She never doubted romance would be in her future, too. The storybooks offered endless possibilities. And as she grew older, Izzy crossed them off. One by one by one. *…
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2
Say Yes to the Marquess

Book cover of Say Yes to the Marquess
Your presence is requested at romantic Twill Castle for the wedding of Miss Clio Whitmore and ...and ...? After eight years of waiting for Piers Brandon, the wandering Marquess of Granville, to set a wedding date, Clio Whitmore has had enough. She's inherited a castle, scraped together some pride, and…