Liz and Ben's wedding day arrives, but Vernon's efforts to make the party go off with a bang ends in chaos when Ben finds himself assisting Rob and the team when a banker's wife is kidnapped. Merton faces the toughest decision of his life as the extent of Jenny's mental issues becomes clear, forcing him to choose which is most important to him: his wife or career. Helen Trent's dreams of a fresh start for her marriage look set to be shattered, and Bellamy is delighted when he is promoted to acting sergeant in Merton's absence.