The Last Olympian (Percy Jackson and the Olympians book 5)

In the fifth, and final book in this series, the evil Titan, Kronos, and his army has risen and become very strong. After driving many half-bloods out of camp, Kronos is looking to destroy Olympus now. In order to fight the Titans, Percy must bathe in the River Styx, in the underworld, to become strong. He does this, and he is ready to fight. Percy and his friends from camp half-blood go to New York City, to the Empire State building, which is the secret home of Olympus. 

    Percy figures out that he "is not the hero". This means that he will not be the destined one to kill Kronos.  During the fight, Kronos occasionally shifts back to Luke. What I mean by that, is this: because Kronos took Luke's body, Luke is still deep down struggling to get out. Sometimes Kronos, inhabiting Luke's body, will falter. His eyes change from Titan gold, to Luke's blue. his voice changes and he says things as Luke. In the end, Luke ends up killing himself, which means that he is also killing Kronos. 

      The book series was absolutely fabulous. They were all action-packed page-turners, with comedy too. These books are also very educational because they taught me all about Greek Mythology, and the gods and the ancient stories. I loved this book series so much.