Osborne, Mary Pope <br/><br/>
Eve of the Emperor Penguin:  Magic Tree House #40. 

 - New York, NY :  Random House/ A Stepping Stone Book,  2008. 
 - Magic Tree House .
<br/><br/> The magic tree house takes Jack and Annie to Antarctica to search for the fourth secret of happiness for Merlin. 
<br/><br/><label>ISBN: </label>9780375837340