JK Rowling has started to write her first book for adults, which will be a 'blackly comic' tale.
Details of the novel 'The Casual Vacancy', which is to be published later this year, were released today by her on Thursday.
The 480-page book will be set in Pagford, a dreamy spot with a cobbled market square and ancient abbey, which becomes a town at war with itself.
The 46-year-old has amassed a fortune estimated to be more than 620 million pounds from her seven 'Harry Potter' books for children, plus all the spin-off rights.
This will be her first novel since her final Potter book was published in 2007.
The new book, to be published worldwide on September 27 including in ebook and audio formats, begins with the unexpected death of Barry Fairweather, whose demise in his early 40s leaves a space on the parish council.
Publisher Little Brown said it would be a "blackly comic, thought-provoking and constantly surprising" novel.
"It will obviously be a major bestseller, probably the bestselling fiction title this year," the Telegraph quoted Jon Howells, spokesman for book retailer Waterstones as saying.
"The real surprise is the plot detail - she never revealed this much in advance of the Harry Potter novels. We were all expecting some sort of crime or mystery novel, but she has, refreshingly, surprised us all.
"The plot sounds like it will have hints of Mark Haddon and (Alexander) McCall Smith, and the promise of black comedy is very beguiling," he added.