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 point to a picture and wish to go there.

Along the way, Jack and Annie discovered that the tree house belongs to Morgan le Fay. Morgan is a magical librarian from Camelot, the long-ago kingdom of King Arthur. She travels through time and space, gathering books.

In Magic Tree House Books #5–8, Jack and Annie helped free Morgan from a spell. In Books #9–12, they solved four ancient riddles and became Master Librarians.

In Magic Tree House Books #13–16, Jack and Annie had to save four ancient stories from being lost forever.

In Magic Tree House Books #17–20, Jack and Annie freed a mysterious little dog from a magic spell.

In Magic Tree House Books #21–24, Jack and Annie have a new challenge. They must find four special kinds of writing for Morgan’s library to help save Camelot. They are about to set off to find the second of these …