When I was a child of 12 or 13, I loved the Borrowers books. The idea of a family of tiny people, living in my own house and taking, for the most practical of purposes, things we'd thought we'd lost was quite enjoyable. The best part of the books, for me, were the descriptions of what they did with the buttons and baubles they risked their lives to 'borrow' - (imagine bumping into our family cat late one night while you're trying to lug a teacup back home).
Because I was a young girl who thought girls could do anything, I didn't really appreciate Arrietty's spunkiness. As the only child of the last Borrowers in this household, she's allowed to do many things her own mother hadn't done as a child. And perhaps because she can do some things her mother couldn't, she moves a step further and does whatever any boy could do.
I thought I could read these books to my 8 year old, who loves the Harry Potter series and The Wrinkle in Time books, but these books are too difficult for little kids (even those reading at an advanced level).
The language is very British and there are side explanations that are much too lengthy. Evidently I missed, as a pre-teen reader, the notion that the Borrowers might have been fabricated by the boy who was narrating the stories. (It is rather absurd to think that they were made up - I've lost too many socks and earrings in my lifetime, so I know Borrowers exist.)
Before the John Goodman version of the movie, we watched British video of The Borrowers and The Return of the Borrowers (great for younger kids). It was excellent, even though the special effects aren't where they were in the American version, the British version was excellent.
For those 11 and up (to 111) this is a great series to read.