Rick Riordan

Percy Jackson and the Last Olympian - Book 5

Percy Jackson and the Titan's Curse - Book 3

Percy Jackson and the Battle of the Labyrinth - Book 4

The House of Hades (Heroes of Olympus Book 4)

The Mark of Athena (Heroes of Olympus Book 3)

The Son of Neptune (Heroes of Olympus Book 2)

The Lost Hero (Heroes of Olympus Book 1)

Blood of Olympus (Heroes of Olympus Book 5)