I've pared our home library WAY down, but these remain my top shelf, keep forever, changed my life favorites.
Little House: OMG. I've probably read these a hundred times. I retread them as an adult and really struggled with my feelings about Pa. If you haven't read these lately you should.
Sybil: I bought this in a used bookstore in Boulder when I was 14 and it's singularly responsible for my choosing to focus on psychology.
The Red Tent: an awesome girl power story. It also reignited my interest in the Bible. So, so good.
The Woodswoman: Also an awesome girl power book that came to me just as I was getting a little too citified.
The Man Who Mistook His Wife For a Hat: If Sybil brought me to psychology, this book kept me there.
To Kill a Mockingbird: Obviously
I love hearing about what books people love. What's on your top shelf?