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.

8. Nora Roberts

Nora Roberts (aka: J.D. Robb) is well known for her romance novels such as the "Inn BoonsBoro Trilogy" and "Once More with Feeling." Forbes estimates that she made $23 million this year. In the digital realm, Roberts has really picked up sales, selling 3.2 million digital copies last year. That puts her in second place under E.L. James.

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