On Christmas Eve, Jack and Annie's tree house transports them to King Arthur's castle at Camelot, where they undertake a quest to the castle of the Otherworld.

 

This book is part of a book series called Magic Tree House .

There are 146 pages in this book. This is a chapter book. Publishers market early chapter books at readers aged 6-10 years. This book was published 2009 by Random House USA Inc .

Mary Pope Osborne is the author of over forty books for young people. She was the president of the Author's Guild, the leading organization for professional writers in the US, for two years and has won many awards for her books. She lives in New York with her husband, Will, and their dog, Bailey, who sleeps on top of Mary's desk every day while she writes.