Riordan, Rick. <br/><br/>
The house of hades / 
Rick Riordan. 
 - New York :  Hyperion Books,  c2013. 
 - 597 pages ;  22 cm. 
 - The Heroes of Olympus. .
<br/><br/>Includes glossary. 
<br/><br/> Greek and Roman demigods from the Prophecy of Seven must work together to seal the Doors of Death--and help Percy and Annabeth escape the Underworld in the process. 
<br/><br/><label>ISBN: </label>9781423146728 
<br/><br/><label>Subjects--Topical Terms: </label><br/>ADVENTURE STORIES.
<br/><br/><label>LC Class. No.: </label>R56h 2013