Magic Tree House Books 13-16 Boxed Set (Magic Tree House (R)) 

Publisher : Random House Books for Young Readers 

Language : English

Format : Paperback

ISBN-10 : 0375846611

ISBN-13 : 978-0375846618

Join Jack and Annie on four time traveling adventures in books 13-16 of the #1 bestselling chapter book series!

Jack and Annie must save stories that have been lost in history. Morgan, the magical librarian of Camelot, sends them to find the books in the ancient worlds of Roman Pompeii, imperial China, Dark Age Ireland, and classical Greece. Will Jack and Annie be able to save the stories in their darkest hours...or will the books be lost forever?

Books in this set include: 

1) Vacation Under the Volcano (#13)

2) Day of the Dragon King (#14)

3 ) Viking Ships at Sunrise (#15)

4) Hour of the Olympics (#16)