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) holiday romance. Shirley Valentine is a 42-year-old Liverpudlian bored housewife whose life and initially enriching marriage has settled into a narrow and unsatisfying rut, leaving few real friends and her childhood dreams unaccomplished. When her flamboyant friend Jane (Alison Steadman) wins a trip for two to Greece, Shirley uncharacteristically puts herself first and accepts Jane's invitation. Shirley feels considerable self-doubt, and ultimately only goes because of unexpected encouragement from her neighbour Gillian (Julia McKenzie) who drops her air of superiority to reveal her respect and emotional support of Shirley's plans, and former school enemy Marjorie Majors (Joanna Lumley) who reveals