When Siobhan's car is stolen, Marlene spearheads the investigation - despite the fact she's got the day off to get married. Is the bride-to-be just suffering from pre-wedding nerves or is she realising that she's made a terrible mistake?
When Louise's son turns up with a gun, Jo sees an opportunity to prove that Louise is a criminal. Meanwhile Finn's birth mother Assumpta makes some very bad first impressions.
Former Judge Ginette Prince sent a lot of dangerous people to prison in her time so, when someone sets fire to her home, the police officers wonder if the motive is revenge.
With the pub a smoking ruin, Clint suspects that the fire-starter is someone close to home. Meanwhile things between Callum and new detective Jo get hot and heavy.
Callum and Ryan are shocked when they find a young man dead on the beach; is this a "Stag Do" gone tragically wrong? When detective Jo discovers that the dead man has been socializing with her enemy, she turns the heat up.