Bestselling author JK Rowling has revealed that she is the author of the thriller novel The Cuckoo’s Calling, which was published by Mulholland Books under the pseudonym Robert Galbraith. According to Mulholland’s website, Galbraith, spent several years with the Royal Military Police, worked with the SIB (Special Investigative Branch), and left the military in 2003 to work in the security industry.

The Sunday Times uncovered the mystery when they were reviewing the book, and wondered how a first time author/former military officer could have written such a good book. Still, the book had received mixed reviews. “I had hoped to keep this secret a little longer because being Robert Galbraith has been such a liberating experience,” Rowling told The Times. “It has been wonderful to publish without hype or expectation, and pure pleasure to get feedback under a different name.”

Prior to Rowling’s authorship being revealed, the book had only sold 1,500 copies. It’s now out of stock on Amazon and at BarnesandNoble.com. (Kindle & Nook editions are still available!). “You may think you know detectives, but you’ve never met one quite like Strike,” reads the book’s description. ”You may think you know about the wealthy and famous, but you’ve never seen them under an investigation like this.” You might want to add,” you may think you know first-time thrillers, but you’ve never seen them written by best selling fantasy writers.”