Richard Russell Riordan Jr. is an American author, best known for his Camp Half-Blood Chronicles, which includes the Percy Jackson & the Olympians series, The Heroes of Olympus series, The Trials of Apollo series, and The Nico di Angelo Adventures series.
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1 novel by Rick Riordan mapped on Map A Story, each with an interactive map of the book's real-world locations — including history, what's there today, and visitable landmarks.