Washington: J.K. Rowling is `very angry` after finding out that a British law firm allegedly leaked that she had authored a mystery novel, `The Cuckoo`s Calling`, under pseudonym Robert Galbraith.
Law firm Russells admitted on Thursday that one of its partners, unintentionally leaked that the `Harry Potter` writer had authored the mystery novel, Fox News reported.
Rowling`s was unmasked after a newspaper claimed that it had received a tip-off on Twitter.
One of the law firm`s partners, Chris Gossage, had let the information slip to his wife`s best friend, Judith Callegari - the woman behind the tweet.
Russells said in a statement to Rowling that "we apologize unreservedly".
The statement said that while Gossage was guilty, the disclosure was made in confidence to someone he trusted implicitly.
It further said that they can confirm that this leak was not part of any marketing plan and that neither Rowling, her agent nor publishers were in any way involved.
Meanwhile, Rowling said that only a tiny number of people knew her pseudonym and that she is very angry that with the firm as her trust turned out to be misplaced.