*** The Last Olympian, Rick Riordan, 2009
Depending on whether you read the book jacket or the website, this is either the last book in the Percy Jackson series, or the last book in the first Percy Jackson series. Let us hope it is the latter.
As I mentioned in the review of the 4th in the series, if you like contemporary juvenile fantasy series, you owe it to yourself to check out Rick's work, starting at the beginning. And the movie of the first comes out next year, so now is the time to get ahead of the curve. Be the first on your block!