15 highest-earning authors of 2013

Check out the 15 highest-earning authors of 2013. This year's top-grossing author only began writing in 2009.

14. Rick Riordan

Rick Riordan, who has accumulated an estimated $14 million this year, is best known for his "Percy Jackson" and "Heroes of Olympus" series. The second book in the "Percy Jackson" series, "The Sea of Monsters," premiered as a movie on August 7 of this year. 

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