Author Rick Riordan talks about his books, the characters in the books, and who he originally started writing for during an interview before a book signing .
Rick Riordan, creator of the Percy Jackson series for young adult readers, talks to Minnesota Public Radios Kerri Miller about the movies based on his books .
Rick Riordan, author of the Percy Jackson, Kane Chronicles and Heroes of Olympus series, answers fan questions about new book The House of Hades, what .
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