The departure of Shaz has left a vacant cell on G-Wing, though it is immediately filled by a mystery American blonde, Snowball Merriman, who catches Fenner's eye. But Yvonne recognises her as does Karen recognise Yvonne's son. 

Yvonne and Fenner both have different reasons to be concerned about Karen's new relationship. Snowball continues to wrap everyone on G-Wing around her little finger and goes ahead with her escape plan. Di and Neil go on their hen and stag nights but Neil only invites Fenner and slips something into his drink.