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Series
7 books in the catalogue
Book 1
The Hidden Oracle
Rick Riordan

Book 2
The Dark Prophecy
Rick Riordan

Book 3
The Burning Maze
Rick Riordan

Book 4
The Tyrant's Tomb
Rick Riordan

Book 5
The Tower of Nero
Rick Riordan

Rick Riordan The Trials of Apollo Collection 4 Books Set
Rick Riordan

Trials of Apollo
Rick Riordan
Book data and covers from Open Library (openlibrary.org).