Riordan, Rick <br/><br/>
Mark of Athena, The. 

 - New York, NY :  Disney-Hyperion Books,  2012. 
 - 574 
 - Heros of Olympus .
<br/><br/> The Greek and Roman demigods will have to cooperate in order to defeat the giants released by the Earth Mother, Gaea.  Then they will have to sail together to the ancient land - Greece itself to find the "Doors of Death". 
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<br/><br/><label>ISBN: </label>978-142314060-3 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mythology, Roman - Juvenile Fiction<br/>Mythology, Greek - Juvenile Fiction