The Cuckoo's Calling: J.K. Rowling exposed as 'Robert Galbraith' pseudonym

J.K. Rowling wrote The Cuckoo's Calling under the pen name Robert Galbraith. Photo: Associated Press

The Cuckoo's Calling, an obscure crime novel penned by British author Robert Galbraith, had only sold 1,500 copies since it was released this past April, according to the BBC.

On Sunday, the 464-page story shot to the top of Amazon's bestseller list. How did it happen that quickly?

Robert Galbraith isn't Robert Galbraith. Robert Galbraith is J.K. Rowling.

The illustrious author of the Harry Potter series of novels came out as the actual person behind the Galbraith pen name on Sunday to CNN and the BBC, removing a shroud of mystery over who actually wrote the novel.

According to CNN, Mulholland Books, the publisher of The Cuckoo's Calling, described Galbraith as a former member of the UK's Royal Military Police who wrote the story out of personal experiences.

It took an investigation by The Sunday Times to get to the bottom of who Galbraith realy was.

"It has been wonderful to publish without hype or expectation and pure pleasure to get feedback from publishers and readers under a different name," Rowling said in a statement.