I like a good mystery, especially a historical one. My favorites are the Brother Cadfael series by Ellis Peters and the Amelia Peabody series by Elizabeth Peters. Cadfael is a monk in the middle ages, Amelia an Egyptologist in the late nineteen and early twentieth centuries.
I've recently discovered a new mystery series that I'm excited about. This one, too, is historical, and is called "The Lady Grace Mysteries". It's written as the daybooke ( a kind of journal, I guess) of Lady Grace, a young maid of honor to Queen Elizabeth 1. Lady Grace uses the vocabulary of the time period and has a spunky, funny personality, which I find a plus in any book, even a mystery. Though geared toward middle-grade readers, teens and adults would enjoy it too--at least, I did. As far as the mystery goes, it didn't take me long to figure out what was going to happen, but the solution of the puzzle was only half the fun.
The series follows the alphabet. So far I've read Assasin and Betrayal. The author isn't credited on the cover of the book, but it's Patricia Finney.