Jo gets herself into trouble with Tom when she accuses his accountant of being a drink driver. Her problems escalate when a young driver she has previously cautioned is involved in a serious accident. If Jo hadn't been so easy on the girl for the first offence, would the accident still have happened? Ben, meanwhile, has his hands full with cramming for the Sergeant's exam in St. David's. Regaining his stripes and being Sergeant in Mt.Thomas will put his career back on track, but does he really know who he's competing against?