Focus is on a women's prison, HMP Stone Park this show was mainly about the prison staff (not the inmates). Well-groomed, genteel governor Faye Boswell (Googie Withers) tries to liberalise the prison regime. Her Chief Officer was Mrs. Armitage (Mona Bruce). In season 4 Boswell was replaced as Governor by Helen Forrester (Katharine Blake) and then in season 5 by Susan Marshall (Sarah Lawson).