When I want a comforting read that I know I'll enjoy, Lauren Willig is a sure bet. In the last week, I've re-read The Temptation of the Night Jasmine and The Seduction of the Crimson Rose. Both are lovely, spy-filled reads. With romance, mystery, history and a bit of adventure, the whole Pink Carnation series is one of my favorites.
Side note: although the books may appear to be just fluff, Willig is very intelligent and knows her history--she has several master's degrees and was (still is?) going after her Ph.D. But she makes history fun to read about it.