Agatha Christie her service in September 1918. After the war, Agatha and Archie Christie settled in a flat at 5 Northwick Terrace in St. John's Wood, northwest London. Christie had long been a fan of detective novels, having enjoyed Wilkie Collins's "The Woman in White" and "The Moonstone", as well as Sir Arthur Conan Doyle's early Sherlock Holmes stories. She wrote her own detective novel, "The Mysterious Affair at Styles", featuring Hercule Poirot, a former Belgian police officer noted for his twirly large "magnificent moustaches" and egg-shaped head. Poirot had taken refuge in Britain after Germany invaded Belgium. Christie's inspiration for the
Hercule Poirot the Poirot stories also appeared, most recently twenty-seven of them on BBC Radio 4 (and regularly repeated on BBC 7, later BBC Radio 4 Extra), starring John Moffatt; Maurice Denham and Peter Sallis have also played Poirot on BBC Radio 4 in "The Mystery of the Blue Train" and in "Hercule Poirot's Christmas", respectively. In 1939, Orson Welles and the Mercury Players dramatised "Roger Ackroyd" on CBS's "Campbell Playhouse". A 1945 radio series of at least 13 original half-hour episodes (none of which apparently adapt any Christie stories) transferred Poirot from London to New York and starred character actor Harold