There is a new Robert Galbraith novel coming out and this time there is no doubt who wrote it. Author J.K. Rowling’s second effort under the Galbraith banner involves a writer whose acid-tipped pen may have led to murder. Little Brown is publishing Galbraith’s effort as the “Harry Potter” author’s thriller-writing pseudonym. “The Silkworm” sees the return of detective Cormoran Strike, the ex-soldier hero introduced in “The Cuckoo’s Calling.” In the new book, Strike investigates the disappearance of a novelist who has written a book that features scathing descriptions of real people. “The Cuckoo’s Calling” attracted little notice when it was published last year, but rocketed up the charts once Rowling was outed as its author. “The Silkworm”‘ will be published June 19 in Britain.