The Mary Russell series. This is one of my favorite series and I have reread it more than once.
1. The Beekeeper's Apprentice
2. A Monstrous Regiment of Women
3. A Letter of Mary
4. The Moor
5. O Jerusalem
6. Justice Hall
7. The Game
8. Locked Rooms
9. The Art of Deception
10. The Language of Bees
11. The God of the Hive
12. Beekeeping for Beginners (ss)
13. Pirate King
14. Garment of Shadows