Heartbeat (1992)

Season 6: Episode 16

An old flame of Eileen's turns up. He is a French man named Antonin, who urges Eileen to marry him. She declines because of her commitment to Katie. Nick goes undercover as a harbour worker to catch an escapee prisoner. Phil goes missing during the operation and is found trapped on one of the boats. Claude is buying fish under false means, Nick notices what's going on and advises him to stay away from Whitby - which is where the investigation is taking place.