The Sea of Monsters (Percy Jackson and the Olympians, Book 2)
The Titan's Curse (Percy Jackson and the Olympians, Book 3)
The Battle of the Labyrinth (Percy Jackson and the Olympians, Book 4)
The Last Olympian (Percy Jackson and the Olympians, Book 5)
The Lost Hero (Heroes of Olympus, Book 1)
The Son of Neptune (Heroes of Olympus, Book 2)
The Mark of Athena (Heroes of Olympus, Book 3)
The Blood of Olympus (The Heroes of Olympus)
The Serpent's Shadow (The Kane Chronicles, Book 3)
The House of Hades (Heroes of Olympus, Book 4)