A progressive experimental prison without bars is run by young psychiatrist Dr. Newcombe and harsh but fair Chief Officer Williams. Four hardened criminals, the Spider Gang, arrive at this minimum security prison, the leader of whom is Spider Kelly. Dr. Newcombe has his work cut out trying to reform the boys and enlists the aid of Spider's girlfriend Doll, who, to Spider's anger, is now working as a stripper in Soho. Newcombe seems to be straightening Spider out, while Spider is in turn sorting out a rival imprisoned gang, led by Ted Ross), who hold the monopoly in smuggled cigarettes.
The Monthly Film Bulletin noted "A sequel to Jazz Boat [1960], with the same leading characters and production team, In the Nick is cast very much in the same mould – easy-going mixture of farce and fantasy, loose and ingenuous scripting, excellent (if bizarre) team-playing. James Booth stands out for his genuinely observed portrait of Spider, Bernie Winters appears to be one of those rare comedians who can keep his moronic style of clowning free from offensiveness, and Niall MacGinnis (Governor), Harry Andrews (Chief Officer) and Ian Hendry (rival mobsters) all catch the eye. Anthony Newley is rather at sea as a psychiatrist, but plays with a likable modesty and warmth, and an improved Anne Aubrey discretely burlesques Jayne Mansfield. There is much in this film that is conventionally weak and structurally uneven, yet it gets closer to contemporary feeling than numerous more ambitious comedies. The dialogue, particularly, strikes an authentic note, and Ken Hughes' debt to Frank Norman, who wrote the original story, seems considerable."[6]
TV Guide noted, "Though there are some genuinely funny moments in the film, Newley is miscast as the compassionate psychologist. Though relatively straightforward for its first half, the plot becomes convoluted and the motivations are twisted in the second half."[5]
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