7 books in series
The Heroes of Olympus
The Heroes of Olympus is a 7-book series with 5 primary works first released in 2010 with contributions by Rick Riordan, Ignacio Gómez Calvo, and Nick Chamian.
The Heroes of Olympus is a 7-book series with 5 primary works first released in 2010 with contributions by Rick Riordan, Ignacio Gómez Calvo, and Nick Chamian.