Riordan is famous for his Percy Jackson and the Olympians series. He also wrote the Tres Navarre mystery series intended for adults and helped edit Demigods and Monsters, a collection of essays on the topic of his Percy Jackson series. In addition, he published Maze of Bones for Scholastic, which is the first book in the 39 Clues series of books. Riordan also wrote a series of interactive stories in the app Demigods of Olympus. Recently featured: The Titan's Curse | The Lost Hero | Annabeth Chase | Nyx | The Quest for Thanatos