I first read these books about Percy Jackson some years ago and that some of Rick Riordan’s books in the Percy Jackson series had been turned into movies.

Percy Jackson and the Olympians: The Lightning Thief

Percy Jackson and the Olympians: The Sea of Monsters

Percy Jackson and the Olympians: The Titan’s Curse

Percy Jackson and the Olympians: The Battle of the Labyrinth

Percy Jackson and the Olympians: The Last Olympian