The babysitters club novels
My daughter loved these books, she still has the entire collection that was available when she was a teenager. When I was young my favourite books were The Famous Five and The Secret Seven. I read them over and over and imagined I was a part of the adventures. A few years ago big w had a new release of the full sets of both these books, I bought a set of each, encouraged the grandchildren to read them and they all enjoyed the stories as well.