Books by Rick Riordan 30 titles
The Lightning Thief
The Sea of Monsters
The Battle of the Labyrinth
The Titan's Curse
The Last Olympian
The Lost Hero
The Red Pyramid
The Throne of Fire
The Mark of Athena
The Son of Neptune
The Blood of Olympus
The Sword of Summer
The Serpent's Shadow
The Hidden Oracle
House of Hades
Percy Jackson's Greek Gods
The Hammer of Thor
The Burning Maze
The Ship of the Dead
Percy Jackson's Greek heroes
Camp Half-Blood Confidential
The Tyrant's Tomb
The Sun and the Star
9 From the Nine Worlds
Demigods & magicians
The Demigod Files
Camp Jupiter Classified - A Probatio's Journal
The Court of the Dead
For Magnus Chase: Hotel Valhalla guide to the Norse worlds
The Demigod Diaries