Alibi is a 1928 play by Michael Morton based on The Murder of Roger Ackroyd, a novel by British crime writer Agatha Christie. It opened at the Prince of Wales Theatre in London's West End on May 15, 1928, starring Charles Laughton as Hercule Poirot. It was deemed a success and ran for 250 performances closing on December 7, 1928. It was the first work of Agatha Christie's to be presented on stage and the first ever adaptation of one of her works for any medium outside of her books.