Percy Jackson & the Olympians is a pentalogy of adventure and fantasy fiction books authored by Rick Riordan. The series consists of five books, as well as spin-off titles such as The Demigod Files and Demigods and Monsters. More than 20 million copies of the books have been sold in more than 10 countries.
The Lightning Thief, the first book, is the basis of a film called Percy Jackson & the Olympians: The Lightning Thief, which was released in the United States and Canada on February 12, 2010.