For early teen girls: The Beekeeper's Apprentice, by Laurie King. It is about a 13 year old girl who becomes Sherlock Holmes' apprentice. Again, I think my D loved it so much because she is very like the gifted female girl in the story. There are several more in the series, but that is the one that D read until it fell apart.

Has anyone read through the whole series? DD9 just read the first book, loved it, and I know she's going to want to read more. Is there anything inappropriate for a pre-teen that I need to be aware of as we work our way through the books?