JK Rowling's secret bestseller: 'The Cuckoo's Calling' by 'Robert Galbraith'

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JK Rowling, the author of the Harry Potter book series, recently wrote a bestseller that no one knew about. "The Cuckoo's Calling," written by a " Robert Galbraith," won rave reviews. But no one knew that Rowling was the real author behind the pen name.

"The Cuckoo's Calling," released in April of 2013, is a crime novel in which private investigator looks into the murder of a model after she falls from a balcony. Published by Sphere (a division of Little Brown publishing), the book was marketed as Robert Galbraith's debut novel. The Galbraith name was acknowledged as a pseudonym on the Little Brown website, but nothing indicated who the true author could be.

Critical acclaim for the mystery novel was enthusiastic and sales reflected the interest.

But, until a July 14 interview in the Sunday Times, no one seems to have had any idea that the author of one of the world's most successful book series was behind "The Cuckoo's Calling."

"Being Robert Galbraith has been such a liberating experience," Rowling said in her interview. "It has been wonderful to publish without hype and expectation and pure pleasure to get feedback under a different name."

Rowling's previous novel, "The Casual Vacancy," received mixed reviews and was constantly compared to the seven books of the Harry Potter series. Without the pressure of such comparisons, it seems that the author has achieved greater success.

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