Riordan, Rick, <br/><br/>
The house of Hades / 
Rick Riordan. 
 - New York :   Disney/Hyperion Books,  2013. 
 - 597 pages ;  22 cm. 
 - Heroes of Olympus ; 4 .
<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/>Mythology, Roman--Fiction.<br/>Mythology, Greek--Fiction.<br/>Giants--Fiction.<br/>Camps--Fiction.<br/>JUVENILE FICTION / Fantasy & Magic.<br/>JUVENILE FICTION / Action & Adventure / General.