Cover for new Agatha Christie novel, 'The Monogram Murders'

Agatha Christie may no longer be with us, but her works are still being published — sort of. Thirty-nine years after the last Hercule Poirot novel, Sophie Hannah is adding a new twist to the story of the famous detective.

Hannah, the author of six mystery novels, is adding a new book to the Poirot canon: The Monogram Murders. The book will be set in 1920s London, around the time of The Murder of Roger Ackroyd. HarperCollins, releasing the book on September 9th, describes it as “a diabolically clever puzzle that will test [Poirot’s] brilliant skills and baffle and delight longtime Christie fans and new generations of readers discovering him for the first time.”

Resurrecting popular book franchises is a new trend in literature. Last year, William Boyd penned a new James Bond book, Solo, with the approval of Ian Fleming’s estate, and the Conan Doyle estate recently approved a new Sherlock Holmes take to be written by Anthony Horowitz. Christie is one of the best-selling writers of all time, so it makes sense for her estate to keep her most popular character alive. Poirot has been in 45 of her books and short stories, the most famous being Murder on the Orient Express in 1934.

Check out an exclusive pic of the U.S. cover of The Monogram Murders below: