Officers are joined by several firearms units, a helicopter and a drone as they track a group of men suspected of attempting to steal from parked lorries. However, it is police dog Bryn who becomes the star of the show, following a mile-long track through fields, a housing estate and a park, all the way to a bridge over a dual carriageway. Meanwhile, Charlie and Rob chase a van suspected of being on cloned plates, but the driver is reckless and dangerous, hitting high speeds while going the wrong way on roundabouts and dual carriageways.