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"The Last Olympian" by Rick Riordan is the fifth and final book in the series "Percy Jackson and the Olympians." The series is about the half-breed children of the gods, the demi-gods, and the adventures and struggles they go through. It is written towards the middle school level, but I thought it was a really fun read as an adult as well!
In "The Last Olympian" Percy and his friends face their greatest challenges yet. Kronos is posed to attack Mount Olympus, and he's managed to lure most of the gods away. This means it's up to Percy and the rest of the demi-gods to prevent Kronos from destroying Olympus, and maybe all of civilization in the process!
Mount Olympus is located above New York City, so the demi-gods are provided with extra challenge as they try to preserve the city while fighting Kronos's forces. They are also provided with some interesting help because of their location, but I'll let you read the book to find out how that works! Oh yes, and did I mention there is a traitor in their midst?
I was a little sad reading this book knowing that it's the last book in the series, but then I got to the end and there's a note from the author that indicates he will be writing more. It looks like there will be a new series with the same premise, but some newer characters. I can hardly wait to see what he does!