Christine has been sent to Germany on a prison exchange. Helen is instructed by prison governor Margaret to look after their German guest Gertrude Verna. Gertie is in prison for murdering and eating her husband and is a celebrity with several books to her name. Helen finds it difficult to keep Gertie out of trouble as Gertie makes her views clear what she thinks of her fellow prisoners. Investigations in the Entirely Tiles office continue.

There is great excitement at Broadmarsh Prison as governor Margaret announces the annual prison choir competition. Helen is persuaded to audition and is certain to be made the lead vocalist until the surpriseappearance of Virna. Meanwhile Laura and Justin are worrying about finances and incompetent lawyer Tony is suspicious of Henry's motives. Widow and Entirely Tiles MD Mrs Bridges makes an interesting discovery. The inter-prison sing-off is judged by Tony Blackburn and the Broadmarsh Prison ladies are excited to see a singing regular from Woolley Grange Prison - Nigel.