Helen has good news for Nikki—new evidence has come to light that will benefit her appeal. But tension mounts between them, due to Nikki’s jealousy over friendships that Helen is forming with colleagues on the outside. However, Nikki is not the only person to be jealous of Helen’s planned evening out with Dominic—he has a secret admirer…Di.

Shaz and Denny continue their mischief-making, and Hollamby becomes the main target for their next stunt. After lock-up, Shaz tricks Hollamby into locking herself into the four-bed dorm and then, into handing over her keys. But this prank turns into a major breach in security when Renee dies in suspicious circumstances. The police have a plethora of suspects to interview and a burning question of how she was killed. Meanwhile, Karen docks Hollamby a month’s wages and reduces her rank from Senior to Basic grade to punish her stupidity.

After the discovery of rat poison in the servery, the police become convinced that Renee was poisoned and, thanks to her history, Shaz becomes their prime suspect. Shaz is quite happy to confess to the murder—she’s already in for life, what difference will one more victim make? But everything changes when the results of Renee’s post-mortem comes back and it transpires that she died of anaphylactic shock—an allergic reaction to nuts. With no proof that anyone knew about Renee’s allergy, her death is ruled accidental. But if this is the case, why does Yvonne look so happy as she eats peanuts in her cell?

Fenner’s morale is deteriorating and he is making a habit of reporting for work hungover and unshaven. When Karen calls round to his house to see him; she discovers that his wife and kids are gone. But will pity turn to something more, as feelings from the past come to the fore?