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