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
Shirley Valentine (film) who want the same food as in Britain. Finally their son tells Joe to go and get her instead of just phoning. Receiving a telegram about Joe's arrival, Costas makes excuses and leaves for the day, while Shirley is unperturbed. Joe walks from the airport. Shirley, wearing sunglasses and now feeling like a different person, is sipping wine by the sea in the sunset. Joe doesn't recognise her and walks past until she calls him back. The film ends with the two drinking wine by the sea, leaving open the question of how the matter resolved. The film was shot