Gilladian
Adventurer
I just discovered the Phryne Fisher mysteries and raced through all 18 of them... they're set in 1928 in Australia, and are about the eponymous "Miss Fisher"; a wealthy, beautiful and exotic young woman who sets herself up as a private detective. Phryne is a bit Mary-Sue, but the stories are good, and fun. However, I do have to say they get rather "warm" in places; there's also a lot of (historically accurate) drug and alcohol use, so not suitable for sharing with younger teens, possibly (I'm a teen librarian, I always have to rate for content; it's instinctive). They might make useful research reading for someone's historical investigation campaign!