Sales of J.K. Rowling’s new crime novel are up 507,000% according to the BBC. The book, titled “The Cuckoo’s Calling,” was written under the pseudonym Robert Galbraith.

Amazon.com Inc. (NASDAQ: AMZN) shows the “The Cuckoo’s Calling” at No. 1 on its list of e-books. Amazon sells the book for $19.22. Little Brown is the publisher. It was not revealed that Rowling was the author until the secret was unearthed by The Sunday Times over the weekend.

Assuming the books sales have reached the implied rate mentioned by the BBC, Amazon is selling half a million a day, or nearly $10 million worth. Rowling is already a billionaire. At this rate of book sales, she may pass Carlos Slim on the rich list. Or, has already.

Amazon described the book:

The Cuckoo’s Calling is a 2013 crime fiction novel by J. K. Rowling, published under the pseudonym Robert Galbraith. A brilliant mystery in a classic vein: Detective Cormoran Strike investigates a supermodel’s suicide. After losing his leg to a land mine in Afghanistan, Cormoran Strike is barely scraping by as a private investigator. Strike is down to one client, and creditors are calling. He has also just broken up with his longtime girlfriend and is living in his office. Then John Bristow walks through his door with an amazing story: His sister, the legendary supermodel Lula Landry, known to her friends as the Cuckoo, famously fell to her death a few months earlier. The police ruled it a suicide, but John refuses to believe that. The case plunges Strike into the world of multimillionaire beauties, rock-star boyfriends, and desperate designers, and it introduces him to every variety of pleasure, enticement, seduction, and delusion known to man. You may think you know detectives, but you’ve never met one quite like Strike. You may think you know about the wealthy and famous, but you’ve never seen them under an investigation like this.

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