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Series
The Heroes of Olympus
8 books in the catalogue
Book 1
The Lost Hero
Rick Riordan
Book 2
The Son of Neptune
Rick Riordan
Book 3
The Mark of Athena
Rick Riordan
Book 4
House of Hades
Rick Riordan
Book 5
The Blood of Olympus
Rick Riordan
The Demigod Diaries
Rick Riordan
The Lost Hero: The Graphic Novel (Turtleback School & Library Binding Edition) (The Heroes of Olympus)
Rick Riordan, Robert Venditti
The Heroes of Olympus Books 1-4
Rick Riordan
Book data and covers from Open Library (openlibrary.org).