A British law firm has admitted that one of its partners inadvertently leaked that J.K. Rowling had authored a mystery novel, The Cuckoo's Calling.
The Sunday Times newspaper revealed over the weekend that the Harry Potter author had penned the book under the pseudonym Robert Galbraith.
The newspaper said it had received a tip-off on Twitter, and there was speculation that Rowling or her publisher were behind the revelation which has sent sales of the book skyrocketing.
But 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 in a statement that "we apologise unreservedly" to Rowling.