Welcome to part three of the story of JK Rowling as crime writer. It’s a pretty good story in itself: bestselling writer attempts to reinvent herself under the radar and is outed almost instantly. Published in 2013, The Cuckoo’s Calling by “Robert Galbraith, a former plainclothes Royal Military police investigator who had left in 2003 to work in the civilian security industry”, was suspiciously accomplished for a debut novel and sold an estimated 1,500 copies. But Rowling’s cover was blown within weeks. Sales soared by 4,000%.