Osborne, Mary Pope <br/><br/>
Christmas in Camelot. 

 - New York, NY :  Random House, Inc,  2001. 
 - Magic Tree House .
<br/><br/> 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 Otherworld. 
<br/><br/><label>ISBN: </label>0-375-81373-X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Time travel--Fiction<br/>Magic--Fiction<br/>Arthur, King--Fiction<br/>Christmas--Fiction<br/>Tree houses--Fiction<br/>Brothers and sisters--Fiction