Percy Jackson & the Olympians, often shortened to Percy Jackson, is a pentalogy of adventure and mythological fiction books written by American author Rick Riordan, and the first book series in the Camp Half-Blood Chronicles. Five supplementary books, along with three graphic novels, have also been released. More than 45 million copies of the books have been sold in more than 35 countries.
As of October 28, 2011, the series has been on The New York Times Best Seller list for children's book series for 223 weeks. The first book was adapted into a film titled Percy Jackson & the Olympians: The Lightning Thief in 2010, which was commercially successful, but received mixed reviews. An adaptation of the second book, titled Percy Jackson: Sea of Monsters, was released in 2013.