J.K. Rowling, the Harry Potter author, has announced her first adult novel will be called The Casual Vacancy.

J.K. Rowling revealed in February that she was working on the book, and said it would be “very different” from her previous material.

The new book will be published worldwide in hardback, e-book and as an audio download and CD on 27 September.

“The freedom to explore new territory is a gift that Harry’s success has brought me,” J.K. Rowling said.

J.K. Rowling has announced her first adult novel will be called The Casual Vacancy

The story is centred on the death of Barry Fairweather, whose unexpected passing shocks the local villagers of Pagford.

Publishers Little, Brown & Co said: “Pagford is, seemingly, an English idyll, with a cobbled market square and an ancient abbey, but what lies behind the pretty facade is a town at war.”

The publisher describes the tale as being “blackly comic, thought-provoking and constantly surprising”.

More than 450 million copies of J.K. Rowling’s seven Harry Potter books have been sold worldwide.

The novels, about a boy wizard who survives the attack that kills his parents, became a worldwide phenomenon and were turned into eight blockbuster films starring Daniel Radcliffe.

When the final installment of the book series went on sale in 2007, thousands of copies sold in minutes.