The Battle of the Labyrinth
Rick Riordan
Percy Jackson and the Olympians (4)
The Demigod Files
The Last Olympian
Percy Jackson and the Olympians (5)
The Sea of Monsters
Percy Jackson and the Olympians (2)
The Lightning Thief
Percy Jackson and the Olympians (1)
Lost Hero, The
The Titan's Curse
Percy Jackson and the Olympians (3)