The Dark Prophecy
Rick Riordan
The Trials of Apollo (2)
The Hidden Oracle
The Trials of Apollo (1)
The Blood of Olympus
The Heroes of Olympus (5)
The Heroes of Olympus
The Heroes of Olympus (1)
The Mark of Athena
Heroes of Olympus (3)
The Son of Neptune
Heroes of Olympus The (2)
The House of Hades
Heroes of Olympus (4)