The Ethel Proudlock case refers to a 1911 shooting by Proudlock, her trial for murder, and the cause célèbre scandalising British colonial society in Kuala Lumpur, Federated Malay States it created.
W. Somerset Maugham wrote a short story about the case which he subsequently turned into a successful 1927 play, The Letter, which in turn received several film and TV adaptions, most notably William Wyler's 1940 film.