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 Carter Dean from raping Roxy Mitchell (Rita Simons) and, finally believing that he is a rapist, tries to drown him in the bath but he recovers and strikes her as Linda enters. Dean then admits that he raped Linda and goes into hiding. Dean confronts Shirley at Mick and Linda's wedding and attempts to drown her. Mick saves her and Dean, who is then arrested over Roxy. Shirley then encourages Mick and Linda to get married and helps Nancy and Lee run the pub while Mick and Linda are on their honeymoon and has Jade help out to give her some