This book is by Mary Pope Osborne.
The story is about a brother and his sister, and how they traveled in time to save Camelot. They were traveling in time with a magic tree house that belonged to Morgan le Fay a magical librarian from Camelot. This book is very nice and very entertaining. I give to this book five stars and I recommend it to read it. New word’s that I learned from this book: valuable, sorcerers, realm.
