The Ruth Rendell Mysteries S10 E07 Front Seat

Hugh and Cecily Branksome retire to the seaside town where they grew up. There they meet again Arnold Cottle, an old boyfriend of Cecily's. She goes to look for a public seat given to the town by her late father, who was a local alderman, and finds it was destroyed and later replaced by another seat given by a suspected murderer. With Arnold's help, she sets out to investigate the unsolved murder.