Only this time she managed to publish it without knowledge and sell 1,500 copies before the secret leaked:
http://www.huffingtonpost.com/2013/07/13/jk-rowling-pseudonym-robert-galbraith_n_3592769.html?ncid=edlinkusaolp00000003
She wrote the novel under the pseudonym Robert Galbraith, and it received a rave review from Publisher's Weekly. Now of course that the secret's out the sales on Amazon soared 150,000%.
But given the description and the review, I may just have to check it out.