Rick Riordan

Trials of Apollo 1. The Hidden Oracle

Heroes of Olympus. The Son of Neptune

Camp Jupiter classified

The Tower of Nero

Percy Jackson and the Olympians. The Chalice of the Gods

The Dark Prophecy

Percy Jackson and the Titan's Curse

Heroes of Olympus. The Mark of Athena

Percy Jackson and the Last Olympian

The Kane Chronicles. The Red Pyramid

Heroes of Olympus. The Lost Hero

Magnus Chase and the Ship of the Dead

The Trials of Apollo. The Burning Maze

Heroes of Olympus. The House of Hades

The Tower of Nero