Riordan, Rick. <br/><br/>
House of Hades, The-Heroes of Olympus, The, Book Four: The House of Hades. 

 - 720  p. 
<br/><br/> House of Hades, The-Heroes of Olympus, The, Book Four: The House of Hades by Rick Riordan (2015) 
<br/><br/><label>ISBN: </label>1423146778