What is The Heroes of Olympus?
{{italictitle}} {{Infobox book series | books = [[The Lost Hero]]<br />[[The Son of Neptune]]<br />[[The Mark of Athena]]<br />[[The House of Hades]]<br />[[The Blood of Olympus]] | genre = [[Fantasy]], [[Young-adult fiction]], [[Mystery fiction|Mystery]] | publisher = [[Disney Hyperion]] | author = [[Rick Riordan]] | illustrator = [[John Rocco]] of book cover | country = [[United States]] | language = [[English language|English]] | pub_date = 2010–2014 | media_type = Print ([[Hardcover|hardback]] and [[paperback]])<br />[[audiobook]]<br />[[e-book]] | number_of_books = 5 | preceded_by = [[Percy Jackson & the Olympians]] | followed_by = [[The Trials of Apollo]] }} '''''The Heroes of Olympus''''' is a series of five adventure and fantasy [[novel]]s written by [[Rick Riordan]], an American author. It follows the ''[[Percy Jackson & the Olympians]]'' series and is followed by ''[[The Trials of Apollo]]'' series and the Daughter of the Deep. The stories are based around [[Greek mythology|Greek]] and [[Roman mythology]], it describes the efforts of seven [[demigod]] heroes to prevent the earth goddess [[Gaia|Gaea]] from waking up with their ship called Argo ll. The first book in the series was released on October 12, 2012 and the last one was released on October 7, 2014.<ref>{{cite web|title=Disney Announces Print Run, Plans for 'Percy Jackson' Spinoff|url=http://www.publishersweekly.com/pw/by-topic/childrens/childrens-book-news/article/44446-disney-announces-print-run-plans-for-percy-jackson-spinoff.html|publisher=Publishers Weekly}}</ref> The series begins with ''The Lost Hero,'' and ends with ''The Blood of Olympus''. Some [[Fictional character|characters]] from the ''Percy Jackson & the Olympians'' series return, including [[Percy Jackson]], [[Annabeth Chase]], Clarisse, Chiron, Camp Half-Blood campers, and several others. There are also some new characters. Some are Leo Valdez, son of Hephaestus, Jason Grace, son of Jupiter (Zeus as a Rom