In 1926, now averaging a book a year, Agatha Christie wrote her masterpiece. The Murder of Roger Ackroyd was the first of her books to be published by William Collins and marked the beginning of an author-publisher relationship that lasted for fifty years and produced over seventy books. The Murder of Roger Ackroyd was also the first of Agatha Christie’s works to be dramatised—as Alibi—and to have a successful run in London’s West End. The Mousetrap, her most famous play, opened in 1952 and runs to this day at St Martin’s Theatre in the West End; it is the longest-running play in history.
Agatha Christie was made a Dame in 1971. She died in 1976, since when a number of her books have been published: the bestselling novel Sleeping Murder appeared in 1976, followed by An Autobiography and the short story collections Miss Marple’s Final Cases; Problem at Pollensa Bay; and While the Light Lasts. In 1998, Black Coffee was the first of her plays to be novelised by Charles Osborne, Mrs Christie’s biographer.