All rick riordan books in order

GREEK:
The Lightning Thief	(2005)
The Sea of Monsters	(2006)
The Titan's Curse	(2007)
The Battle of the Labyrinth	(2008)
Demigods and Monsters	(2008)
The Last Olympian	(2009)
The Ultimate Guide	(2010),					The Lost Hero	(2010)
The Son of Neptune	(2011)
The Mark of Athena	(2012), 				The Demigod Diaries	(2012)
The Demigod Files	(2013), 				The House of Hades	(2013)
Percy Jackson's Greek Gods	(2014), 		The Blood of Olympus	(2014)
Demigods of Olympus	(2015), 				Percy Jackson's Greek Heroes	(2015)
The Hidden Oracle	(2016)
Camp Half-Blood Confidential	(2017), 	The Dark Prophecy	(2017)
The Burning Maze	(2018)
The Tyrant's Tomb	(2019)
The Tower of Nero	(2020), 				Camp Jupiter Classified	(2020)

EGYPTIAN:
The Red Pyramid	(2010)
The Throne of Fire	(2011)
The Serpent's Shadow	(2012), 			The Kane Chronicles Survival Guide	(2012)
Brooklyn House Magician's Manual	(2018)

NORSE:
The Sword of Summer	(2015)
The Hammer of Thor	(2016), 				For Magnus Chase: Hotel Valhalla Guide to the Norse Worlds	(2016)
The Ship of the Dead	(2017)
9 From the Nine Worlds	(2018)