JK Rowling has revealed her crime novels written under the pseudonym Robert Galbraith will eventually outnumber her Harry Potter books.
The author said her plans as Robert Galbraith were “pretty open ended” and that his books would number more than the seven Harry Potter novels she wrote.
The second novel under Robert Galbraith’s name was published in June, and she said she was half-way through writing the third.
JK Rowling was speaking at a rare public talk at Harrogate’s Crime Writing Festival.
Robert Galbraith’s novels follow private detective Cormoran Strike, a former military police investigator in the Special Investigation Branch.
JK Rowling, who began using the pseudonym for her crime writing career after completing the Harry Potter series, said the third Robert Galbraith novel would centre on returning military personnel.
She was interviewed on stage in Harrogate, North Yorkshire, on Friday by fellow crime author Val McDermid.
Asked whether it was true that she would write a total of seven novels under the Galbraith name, JK Rowling replied: “It’s not seven. It’s more. It’s pretty open ended.
“I really love writing these books, so I don’t know that I’ve got an end point in mind.
“One of the things I absolutely love about this genre is that, unlike Harry, where there was an overarching story, a beginning and an end, you’re talking about discrete stories. So while a detective lives, you can keep giving him cases.”
JK Rowling added: “I’m about half-way through the third [novel] and I’ve just started plotting the fourth.”
Wearing a grey suit and pink tie, which she described as “my Robert suit”, JK Rowling told the audience that she started writing under a pseudonym because: “I wanted to prove to myself that I could get a book published on the merits of the book.”
Asked why she chose to write crime stories after the Harry Potter series, JK Rowling replied: “I love crime fiction. I’ve always loved it. I read a lot of it and I think, in many ways, that the Harry Potter books are whodunnits in disguise.
“I enjoy, I suppose, the ‘golden age’ book. That’s very much what I was trying to do in these books – to take that finite number of suspects, the genuine whodunnit style, but make it very contemporary, bring it up to date, and make sure this is a credible person with a credible back story for nowadays.”
Referring to the “golden age”, JK Rowling said she was a fan of authors Agatha Christie, Dorothy L. Sayers, Margery Allingham and Ngaio Marsh, who wrote in the mid-20th Century.
“My very favorite of those four is Allingham, and she’s the least known,” she said.
“The Tiger in the Smoke is a phenomenal novel.”
JK Rowling is also currently working on her first film script, for Harry Potter spin-off Fantastic Beasts and Where to Find Them.