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?
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.
Marlene is appalled that Nicole isn't planning to tell Callum she's pregnant. Finn refuses to compromise himself as a police officer, with catastrophic consequences.