JUST LIKE THE subject, the mystery has been solved.

JK Rowling law firm has admitted that one of its partners revealed that she was the author of the mystery novel, ‘The Cuckoo’s Calling’.

The Sunday Times newspaper revealed that the ‘Harry Potter’ author had penned the book under the pseudonym Robert Galbraith.

It came following tip-off on Twitter to one of its journalists, but there was some speculation that Rowling or her publisher were behind the revelation in an elaborate marketing ploy – which has sent sales of the thriller skyrocketing.

‘The Cuckoo’s Calling’ which JK Rowling wrote under the pseudonym Robert Galbraith.

However, law firm Russells said that one of its partners, Chris Gossage, had let the information slip to his wife’s best friend, Judith Callegari – the woman behind the tweet. Her Twitter account has now been deleted.

Russells said “we apologize unreservedly” to Rowling and said it had informed Rowling and her agent once it learned what had

Rowling said that “only a tiny number of people knew my pseudonym and it has not been pleasant to wonder for days how a woman whom I had never heard of prior to Sunday night could have found out something that many of my oldest friends did not know.”

“To say that I am disappointed is an understatement,” she added. “I had assumed that I could expect total confidentiality from Russells, a reputable professional firm, and I feel very angry that my trust turned out to be misplaced.”

Being a little more light-hearted about the story, Rowling said in a statement that “Robert fully intends to keep writing the series, although he will probably continue to turn down personal appearances”.

- Additional reporting AP

Read: Harry Potter and The Pseudonym: JK Rowling has written a crime novel>