Camp Jupiter Classified
Rick Riordan
The Trials of Apollo (4.5)
Camp Half-Blood Confidential: Your Real Guide to the Demigod ...
The Burning Maze
The Trials of Apollo (3)
Eldest
Christopher Paolini
The Inheritance Cycle (2)
Percy Jackson's Greek Gods
Rick Riordan & John Rocco
The Son of Neptune
The Heroes of Olympus (2)