The Riddle of the Sphinx (Inside No. 9) was characterised by Pemberton as a thriller in the style of Anthony Shaffer's 1970 play "Sleuth", while Shearsmith identified the episode as particularly theatrical, in the style of "Sleuth" and Ira Levin's 1978 play "Deathtrap". BBC executives, according to Shearsmith, saw the episode as a cross between "Sleuth" and Willy Russell's 1980 play "Educating Rita" that read as if it had been authored by psychopaths. The executive producer Jon Plowman suggested that the first half of the episode plays out like a radio play. The word-play and tea-drinking in this part of the episode are, in the writers' opinion, very
Willy Haas in Hamburg. There he wrote for "Die Welt" and "Welt am Sonntag", as well as for other magazines and newspapers. Haas was married three times: from 1919-1921 with the translator Jarmila Ambrozova, from 1924 to 1936 with Hanna Waldeck (who gave birth to their son in 1925), and from 1947 with Herta Doctor. Willy Haas and his wife Herta were buried in Ohlsdorf Cemetery in Hamburg. Willy Haas Willy Haas (6 July 1891 – 4 September 1973) was a German editor, film critic, and screenwriter. He wrote for 19 films between 1922 and 1933. He was a member of the