Amazon offers Magic Tree House Merlin Missions Books 1-4 Boxed Set (Magic Tree House (R) Merlin Mission)  for .  Free shipping with Prime or on orders over $25.

Product Description:
The great wizard Merlin has missions for Jack and Annie! It's a boxed set of Merlin Mission Books 1-4 in the #1 New York Times bestselling Magic Tree House series--let the magic and adventure begin!

Beyond the realms of time and space are lands that exist only in myths and legends. This is where the magic tree house is taking Jack and Annie on the quest of a lifetime! They will visit Camelot, a haunted castle, an island lost in mist, and the Land-Behind-the-Clouds. It is four books and one unforgettable adventure!