Written by Dan Malone on Wednesday, October 3rd, 2012

After being on sale for less than a week, The Mark of Athena by Rick Riordan has toppled The Casual Vacancy by J.K. Rowling on Amazon’s bestseller list.

The fact that Rowling has been removed from the top spot so quick is surprising. One theory is that the fact that the fact that the book got one million preorders may have affected post-release sales.

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