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?

Marlene's uncle Barry is also stressed out. He's worried the church authorities will find out he's officiating at an unauthorized same-sex wedding blessing. Little does he know that Nicole has invited the bishop.

When rookie cop Ryan discovers a burglary at his brother's house, he calls in Marlene for help. Marlene is sure there's something funny going on – and she's proved right when Ryan's brother admits that there was no burglary, he was in the process of leaving his wife. As Ryan discovers what has really been going on in his brother's seemingly happy marriage, he's forced to reconsider the way he's been treating his girlfriend Niamh – and to make a momentous decision.