Trials of Apollo

The Trials of Apollo 1: The Hidden Oracle

The Dark Prophecy (Trials of Apollo #2)

Trials of Apollo, the Book Five the Tower of Nero (Trials of Apollo, the Book Five)

The Tyrant's Tomb

The Trials of Apollo Camp Jupiter Classified: An Official Rick Riordan Companion Book: A Probatio's Journal

The Burning Maze (Trials of Apollo #3)

From Percy Jackson: Camp Half-Blood Confidential: Your Real Guide to the Demigod Training Camp