JK Rowling's Lethal White - the fourth instalment in the Cormoran Strike novels, written under her pseudonym Robert Galbraith - will be released on 18 September, reports BBC.
In a tweet announcing the news, the author also revealed the cover design.
The book will once again follow the private investigator Strike and his assistant Robin Ellacott.
Publisher Little, Brown confirmed the pair will investigate a crime witnessed by a "troubled young man", named Billy.
The "twisting trail" will lead them "through the backstreets of London, into a secretive inner sanctum within parliament, and to a beautiful but sinister manor house deep in the countryside," it says.