Trials of Apollo 4: The Tyrant's Tomb
Rick Riordan
The Trials of Apollo (4)
The Last Olympian
Percy Jackson and the Olympians (5)
The Dark Prophecy
The Trials of Apollo (2)
The Burning Maze: The Trials of Apollo [Book 3]
The Trials of Apollo (3)
The Throne of Fire
The Kane Chronicles (2)