JK Rowling hints at next book title on Twitter and fan guesses it correctly

British author JK Rowling arrives at the Bafta film awards in London, Feb 12, 2017.
British author JK Rowling arrives at the Bafta film awards in London, Feb 12, 2017.PHOTO: AFP

Harry Potter author JK Rowling has confirmed the title of her latest book - after a fan correctly guessed it on Twitter.

Rowling was asked via the social media app to give a hint as to what she would name the fourth novel in her Cormoran Strike crime series.

The British writer hinted that the title was two words made up of _ _ _ H _ _ / _ H _ _ _ and said she would confirm it if someone guessed the title correctly.

After many suggestions including Eighty Shoes, Mashed Chips, Mayhem Sheep and Mighty Thumb, someone correctly guessed Lethal White, said the BBC.

"Well, that was fun," Rowling tweeted, before promising the fan a signed copy of the book, "when I finally finish it".

The Cormoran Strike crime novels, written under Rowling's pseudonym Robert Galbraith, follow a private investigator and his assistant.

Last year (2016), the author revealed that the next book would pick up immediately after the events at the climax of the third novel, Career of Evil, said the BBC.

The British broadcaster is adapting the first two books in the series, The Cuckoo's Calling and The Silkworm.

Rowling is best known for the Harry Potter series of fantasy novels about a boy who discovers he is a wizard destined to beat the dark lord Voldemort. The first book, Harry Potter And The Sorcerer's Stone was published in 1997 and the seven-part series went on to become a global phenomenon, making Rowling the first female novelist billionaire.