One summer day in Frog Creek, Pennsylvania, a mysterious tree house appeared in the woods.

Eight-year-old Jack and his seven-year-old sister, Annie, climbed into the tree house. They found that it was filled with books.

Jack and Annie soon discovered that the tree house was magic. It could take them to the places in the books. All they had to do was to point to a picture and wish to be there.

Jack and Annie visited the time of dinosaurs, old England, ancient Egypt, and a pirate ship.

Along the way, they discovered that the tree house belonged to Morgan le Fay. Morgan was a magical librarian from the time of King Arthur. She traveled through time and space, gathering books.

Jack and Annie are about to start a whole new adventure … in Night of the Ninjas.