Yes, it’s about a mouse.
Laura Ingalls Wilder books.
Nancy Drew books are certainly great mysteries.
My dd read Island of the Blue Dolphins two summers ago, at age 10. She also really liked The Summer I Shrank My Grandmother by Woodruff and Julie of the Wolves.
I’m saving “Watership Down” for next year ~ when my little girl will enjoy it more.
That’s an awesome book for young and old.