S5, E6: In the second of a two-part story, the team question Camerton's ex-wife Sally and it becomes clear that all is not well with her new husband Derek. Is she the victim of domestic abuse? Ex-copper Derek is now a cabbie and after discovering that his cab was seen near the site of Wilson's murder, he becomes a suspect. Meanwhile, Shap finally catches up with Camerton who convinces him that there is another explanation for his conviction of GBH on Sally and for the domestic violence already suspected in the Jowell house. With Richard on his case Shap finally reveals his link to Camerton and tells him what he knows. How will Janine feel when she discovers Shap's underhand investigation - and can they find enough evidence to bring in their suspected murderer? Meanwhile, DCS Hogg, aware of the pressure Janine is under juggling her role of single parent with being a DCI and encourages her to apply for promotion to DCS with more sociable hours. But will Janine sacrifice the job she loves?